Speed, size & Soyez
Two things:
#1: Given the speed of the possible space junk the hole it's going to make in the side is going to be about the same size as the bit of junk. I think a small bit would be ok 'cos they could lock down the breached section(s) before too much air escaped. Bigger bits mean more air gets out. Of course if it happens to fly through your astronaut or hits a few sections things may be bad....
#2: They probably hide in the Soyez as if everything goes horribly wrong (fires/major structural failure/hole too big to patch and wrong side of door) they can just eject and land safely on earth. If the Soyez does get hit then they're screwed... but if anywhere else does that's the best place to be.
Biting the hand that feeds IT
