The other day I was playing a 40k with my eldar army. I am using a mech army with lots of wave serpents. My opponent destroyed one of my wave serpents and claimed that since the wave serpent only had one access point that the passengers inside would be automatically pinned once the vehicle is destroyed. A few people were around the table and they also confirmed this. Since I have recently restarted playing I assumed they were correct, however I have found nothing about this in the BRB. Can anyone help me out? Does it really work like this?