Centurions and Dig spell

seems to be buggy. There is a pit made by an invoker at centurions. I walk in from the south but the pit prog fires and drops me. Now I can't walk out from centurions because they treat down as the direction I came from. I would expect the centurions to either stop me from falling into the pit if they don't let me leave a different direction from when I came or to ignore that I dropped into the pit and still let me walk out the way I came. I didn't live long enough for the pit to close up but I wouldn't be surprised if that use case resulted in no way to leave centurions without pay or kill.