One of the things we are aware of with many sufferers of PTSD is that as they come back to Canada and are trying to deal with the issues, certain things can be triggers. When those triggers or those buttons get pushed, they can be instantly back in the stress situation that caused it in the first place.
One of the things that can happen--and I've heard sufferers talk about this--is that they react as if they were in that different environment. The reaction may be an appropriate reaction if you're under fire in a war zone, but it can result in very inappropriate behaviour and action if you're on a downtown street in Canada somewhere. So we've certainly heard of that.