Bug in Fane collapsed trap

athena

i use deft strike on my TR now, along with stealth LB that gives a serious damage hit over long range, so i did that to the snakes across the trap. The trap was fallen when i did it. i killed the snakes and then when my partner found the key i raised the ledge near the snakes. he raised the ledge at the start and then came over. And couldn't get through. There was some kind of barrier raised where the switch was at the snakes. I killed myself and was reso at the second switch and i couldn't get through. we had to go back to start exit and come back in to finish fane.