"Definitely less threatening," Elero replies. "Also less able to tell us what the heck's going on.  Now," he shrugs, "since they don't expect us to be in here, it'll likely result in a fight.  I'm just throwing out alternatives."

If someone wants to go in making some kind of speech to talk to these people that's fine. Whoever wants to do that will need to roll a check depending on the manor of their speech. Also, this may result in them listening to you for a minute then attacking you, rather than a full on negotiation. It depends on the effectiveness of your speech and how well you roll.

Zoveldra knows she isn't great at social interaction so will leave it up to the others.

Mark knows that all he had seen from these people is bloodshed and fear. “I advocate we finish this once and for all. No matter what they say they are going to continue their plans. We have the advantage of surprise but it will not last if we hesitate.” He notch’s a bolt and prepares an attack on the giant orcs skull. He will use his magical bolt. He will not fire unless the group agrees to attack.