They can absolutely get stuck in a place where the game can't teleport them back to the trial area. The creep would just stand still. As a result, you deal 0 damage to them due to how the mode is designed, and there is no other way to "complete" the trial than killing yourself and redo the entire process.
They can absolutely get stuck in a place where the game can't teleport them back to the trial area. The creep would just stand still. As a result, you deal 0 damage to them due to how the mode is designed, and there is no other way to "complete" the trial than killing yourself and redo the entire process.