I had this happen to me as well, I fixed it by using a combination of a nearby freight hook and Devil's Kiss.
I've avoided this thread for ages so I don't know if this has been brought up before, but it looks like I've got a game breaking bug on the xbox:
I'm tring to get to the third tear, but three enemies seem to be stuck underneath the steps of the building I need to go into. The door needs to be unlocked but Elizabeth can't as there are enemies nearby. But the enemies are in the stairs and can't be got at
I've restarted from the checkpoint, restarted the game but the problem won't go away. If anyone knows of this or a way around it I'd be very happy to hear about it, I think I'm near the end (on hard) and as much as I'm loving it I'll be rather fucked off if I have to start all over again.
XBL/ PSN/ Steam/ NNID - MatMan562