I've had newbs do really dangerous stuff like that, it's genuinely scary. Yeah, I mean, no worries, when you're starting BJJ out you're actually more dangerous to yourself and others and people don't know if they can trust you to keep them and yourself safe. You're still too new to know what a dangerous situation is. Best way is to just go in with nothing to prove (not even that you can be a good student!) and just relax and flow. If you get stuck, tell them you're stuck and ask them if there's a way out of this. Chances are, most people will say something like "roll forward over your shoulder, because I haven't locked up the omoplata yet" or "Nah bro, tap or snap, OSSSSSS!" Also, yo, why don't we have a 'hang ten' emoticon yet?