Corrected entry: During the final scene with the laser collar traps, we can see that there are seven lasers attached to the collar (as per the bottom-up view of the beams burning through the ceiling above Halloran.) However, when the trap goes off, it makes eight cuts (as per the top-down view of Halloran's former head).
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Correction: The cuts all line up perfectly, so one could assume that the "extra slice" on the back of his head is from the laser in the front, as the slices on the front and back line up. It just depends on how strong the laser-cutters are. As indicated earlier in the film, they are strong enough to slice through metal quickly and with ease, so it could be assumed that they would go through flesh and bone like butter. (You also gotta remember, the bone in the skull is actually pretty thin for the most part).
TedStixon