The limitation is not applied directly with the mechanic. You can’t move or be moved because you would die, so I removed any moving controls; so I took the “you move you die” literally. Also is part of the narrative in this case. Other games were allowing limited move which is also a valid idea imho. As you progress, each dungeon will fire more fireballs at you (randomly but always from one the 4 torches toward the player). As soon as a fireball disappears another one is fired unless you can push it out through an opened door.