Every time any player enters a Trapdoor square (voluntarily or otherwise), the player is immediately removed from play. Treat them exactly as if they had been pushed into the crowd. If the ball ever comes to rest in a Trapdoor square, it will be enthusiastically thrown back out by a helpful groundskeeper. The ball immediately deviates from the Trapdoor square.
Building an army? Create, validate and share your list with New Recruit, army builder for Blood Bowl and many more games.
Try the builder