Hopping to my destiny

[Fleische]

I've got to (I assume) the final level. I just had a very long lift journey down followed by Mandus saying 'oh god! oh Christ! what is this place?' The lift doors open and I go to step out...

But I can no longer walk! Everything else works, so I can look around, do lots of crouches, practise my morse code...

I can also jump. By holding down W while I jump I can move forward while in the air. So I hopped out of the lift.

But this give the endgame a (I really hope) unintentionally comical feel so I saved and exited rather than playing on (and no, reloading the game and continuing hasn't fixed it).

Help?