Grappling along a wall,
then moving the camera (mouse) underneath Lara
can cause the grapple-line suddenly stretch out horizontally against the wall!... with Lara walking stationary at the end of it.
... while Lara keeps moving her legs, stuck at the same spot.
The only way to release her was to first select the opposite direction she's swinging, then hit "E"
This happened several times on this place, at both sides of the stone structure.
In a new session i haven't been able to reproduce it anymore (yet) though.