In generall it means you'll have to to get past the 2 doppels and make the beampad available with just one detonation and let the white ones walk the normal path.
Actually i can't think of a way with the blacks detonation radius to reach that goal. Perhaps someone else gives it a thinkover or can confirm that this was finished without bug usage (i hate it to accuse someone of that

PS: Or is there a trick to get the shooting mechanism let the clones shoot further? Or some hidden secret exit? i think i blew up the whole Level in search for anything
