I was playing a 2 player game this afternoon and came across this interesting(to me, at least) scenario:
On my turn, I drew a 3 way corridor and must move again. I moved in the direction of the south edge of the board, and arrived at that edge. I then drew another tile - a bridge tile. So it's either cross or stay on the same side. I can't move because I'm at the edge of the board, so I chose to stay and move back to the corridor on my next turn. However, the other player drew a "Curse of the Wizard", which shifts the orientation of all corridors. So on my turn, I am now unable to turn back. The tile is also unsearchable. So I died as a trapped hero.
Now, could I have just jumped down the bridge and take 1d6 damage instead? As in, attempt to cross but failing my agility test on purpose?
Technically, you couldn't just choose to jump down from the bridge. If you don't try to cross, then you MUST return to the tile you came from. You can only ever attempt to cross (and maybe fall to the catacombs) the first time you enter that chamber. So, going by the rules, you had to die (or hope someone else rotates the corridors again).
Thematically, it makes absolutely no sense that someone would just sit there and starve to death, or allow himself to get eaten instead of going down to the catacombs to find another way out. So you may just want to houserule that you can jump down on purpose in the very small chance that this instance occurs.
However, that may open a can of worms - why can't they jump off the bridge willingly anytime they want to enter the catacombs? Why are you forced to cross on a good roll, if you want to enter the catacombs and there are no stairs around?
Overall, your best bet is to hope it never happens again