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I see that a few people are jumping full-face mountain bike helmets for BASE, but I was wondering how they behave on terminal jumps? They don't have the neck/chin baffle of a skydiving helmet, so do they fill with air and try to come off your head? Move around a lot?
Thanks.

I'm going to venture to say that on a terminal BASE jump it would behave much the same as on a terminal skydive, so you could always just do some skydives with one to find out.

You could do balloon jumps too if you're interested in what it does sub-terminal.

but that's just this low-time skydiver's opinion....