I had this problem with a animation called "FXexecution" The loon would only get on his knees for a second then stand back up, I was using this code
loonname switchmove "FXexecution"
Then along came a patron called Blanco who showed me a trick using this code
loonname switchmove "FXexecution
~1.8
loonname playmove "FXexecutiondead"
Now first you read the code and it looks like the loon will crouch then die
but he stays on his knees forever and does not fall over dead
So I would try using the crouch command then putting this after it
~1.8
loonname playmove "FXexecutiondead"
Im at work right now, I actually need to see if this "bug" works with any other animations, I will post back soon!!!