“Run!” Mau shouts over the sound of the rushing water towards Rabbit “If we run we can make it to the others”.  Mau begins to sprint back towards the entrance (using dash and Feline Agility if necessary)

Rabbit will take her cue from Mau and run as fast as she can towards the entrance. (Using Dash as well.) 

As you both turn tail (haha) and try to make for the entrance, you are fast but torrential waves of water down an incline is faster. After 10 feet, the waves reach you and sweep you up. You fling your hands out to grab anything.......Both make a strength save (acrobatics or athletics)....

(or you can choose to let the waves take you. In that case, no check is needed). 

acrobatics: 8

(Just to clarify, you are asking for a Strength-Acrobatics Check or Strength-Athletics Check  or a Strength Save?  (All the same for me, but technically different things.)  Or is a straight Dexterity-Acrobatic Check ok?  (I think that was what Mau did.) 

(Rabbit Acrobatics Check: 9, this would be -2 if one of the Strength based rolls)

[Thanks Rabbit.  I was looking for a saving throw and I should have said strength or dexterity].

You are both overtaken by the waves and knocked prone.  In addition, the waves throw you against the ground, walls, and stalagmites.  Each of you take 2 bludgeoning damage.

Krull, Edryd, and Wolfe, you hear the rumble from within and easily see the waves before they get to you.  You backup a few steps and see both Rabbit and Mau in the deluge.  They end up about 15 feet from the cave entrance, soaking wet and banged up...

(I think for DEX Save both Mau and I would have had another +2 to the rolls. Not that it likely matters much.) 

Rabbit quickly tries to regain her feet, despite the cuts and bruises from her ride among the waves.  Regaining her bearings, she turns towards the cave entrance as though anticipating something to come from there. 

"Rabbit, are you alright?" Wolfe quickly gets down and checks on Rabbit, fully prepared to give her the kiss of life, but then realizing she just has a bump on her head he instead moves his hand over it and a healing light makes the pain swiftly go away. Healing Light 2
"Edryd see to Mau will you. Krull watch for goblins, I think we lost the element of surprise." He says holding Rabbit in his arms. "Now what did you two do in there?"

Rabbit shakes her head at Wolfe. "Mau is far more hurt than I, hit with a javelin.  Got the goblin though. Clearly spotted me though."  She sounds a bit disappointed in herself.  "Expect they'll come after us after that."

"Edryd's got Mau, right Edryd?" Wolfe answers and moves up to the side of the cave entrance, peeking in. "Let's hope they come after us then." He adds, ready to blast away.
Perception: 18

(OOC: Don't think I can go back on that healing roll Culuril :-)

Krull looks at both of them "having fun eh?! Well you aren't hurt are you?"

"Not any more Krull, now focus on the goblins!" Wolfe responds, ready at the cave entrance.

Mau is slow to rise, coughing up water and blood, the wound on his back bleeding greatly.  He sits on the bank his head held low, gasping for breath.  “We didn’t get far, clearly the caves are trapped though.”  He pauses catching his breath “they’ve got wolves guarding the entrance as well.” Mau looks towards Rabbit “thank you for your assistance in there, I may not have survived without your magics.”

"Be still Mau, there is no pain while you stand in the moon's light," Edryd closes his eyes and his hands glow a soft silver light. 

Cure Wounds: 4

"We should be prepared for what is to come" placing a hands on Krull's shoulder he uses Vigilant Blessing, giving him advantage on his next initiative roll.

Rabbit nods to Mau, "Umm, yea... just important we got the goblin.  Before more damage was done."

Wolfe, looking in the cave mouth, other than a few fish flopping on the now wet path, you don’t see anything.  You think you hear some noises, other than the stream, but you can’t make out any words. 

The javelin also washed downstream as well. 

Krull looking inside the cave says  to the others "this time we go all in..if more goblins are there we deal with them..but first the wolves or they will alert them"

he looks at the javelin that been washed ashore and tries to pick it 

Rabbit casts a look over at Krull. "Ok.  Not sure it matters now, those inside know something's up. 'Less they think the flood took care of us." 

Unless there is more activity than that of a few flopping fish in the tunnel after a while Wolfe turns to the others again. "Alright, we have to assume they are prepared for us coming in now. Edryd, you should take point with that shield of yours. The rest of us stay behind him, I still have some healing light Edryd, should they get past your shield and armor." Wolfe suggests to the others, motioning for Krull to go in second and then Wolfe, Rabbit and Mau in that order. "Be prepared to fall back to the cave entrance in an orderly fashion if the opposition seems to strong. And Edryd, better keep a good lookout for more of those traps in there."