How well do you know your colleagues in a real disaster time? Well, in the army that's a very good question. who will do run forward and who will panic? Actually, there are two parameters: the first is the unknown. There is no way to really tell who will react how. That's a question that army officers deal with and they haven't figured out a way.
The second is: when people go through several "disaster" options, when people do the drill (disaster recovery for example) then they know what to do. It's that simple.
So you shouldn't ask yourself "how well do you know your colleagues?". You should ask yourself "what do I want my colleagues to know?"
Personally, when I fell I asked for a certain colleagues. She was as resourceful as I thought she would be.
How to survive air crushes