Logically, if he activated the lever, the wall would gain speed again, although in this case, and despite having turned off all the torches except the last one, Ikky doubted that the wall would not accelerate without stopping, it was clear that it would not be all that simple.
The problem was that there was no exit there, if he stayed at the end of the tunnel he would be crushed, the only option was to go back, the exit had to be somewhere between the place where the wall had stopped and the end of the tunnel.
