Tilly follows Droogan. 

"Something needs to set this s@#$ off. Like somebody break a huge f@#$in bottle or something." 

 The sound of a bottle breaking.

"That was f@#$in convenient."

Droogan tosses the stone over the crowd into the guards as he ducks into the alley.

Attack roll no proficiency and disadvantage: 6 damage: 6

It sails over the crowd, over the guards, and clear out of the canyon, in the distance you hear a chicken cry out...

That a crit fail!

As you throw the rock you stumble on another and it goes flying straight for Valentinus! Dex save of 6 :P

meanwhile the smashing 'bottle' has the desired effect and combat is joined as both sides roar and the sounds of sword on sword ring out across the street and beyond.

Bowlder (and the rest of the party, I would guess) follow them into the alley.

If there is no one else in the alley, Bowlder asks if this would be a good time for Pass without Trace, or save it for later.

"How far is it to our goal, the stockades? Maybe keep it for now."

it will take maybe 5 to 10 min judging by the map.

That was Valentinus needing to make a Dex save? Okay: 18.

"Careful, now."

"Sorry, just getting over excited, I guess."

"So are we just going to skirt around, let these idiots fight it out between themselves. Or shall we go and beat up some more arena guards? I say dodge them and head off to the hideout as soon as possible."

Tilly gives Yordis the stink eye "You're no fun...but FINE! Let's go beat the hell out of some $#@$ guards."

Yordis, Bowlder, Droogan, and Valentinus are starting to move away from the brawl when suddenly mid sentence Tilly is going the other way...

Or that's what Droogan imagined was about to happen

"Oh, no..."

He turns to find, with a sigh of relief, Tilly is still pointed in the same direction.

I read that as Tilly was going to beat up Arena Guard in the arena not here in the street.  If I'm wrong then I will second the "oh, no.." and raise you a "here we go again!"

No, she's going with you guys.

"I'm sure there will be plenty enough thugs to beat up once we arrive."

Quote from Cleco8 >>

... I found a secon-d-r-y? scend-a-r-i-e? whatever, they has another base in sim caves nearby. ...

Quote from BDaddLy >>

Yordis, Bowlder, Droogan, and Valentinus are starting to move away from the brawl when suddenly mid sentence Tilly is going the other way...

Or that's what Droogan imagined was about to happen

"Oh, no..."

He turns to find, with a sigh of relief, Tilly is still pointed in the same direction.

You reach the point on the map marked with a big star.

It is a two story building with the windows boarded up. There is a single door and no noise can be heard within. It sits alone with the plot either side of it empty. 

"Subtle or Bold?... Lets try the subtle approach, and call the other "plan B". 's worked out so far, yes?"

"Subtle... So we should break in the boarded windows, instead of bashing down the front door, right?"

Bowlder doesn't do this. He waits for the group to decide on the appropriate plan of action.