Corrected entry: In the scene where Mac and Dillon attempt to kill the predator you see the rear view of Mac's head being blown clean off his shoulders, yet when Dillon discovers his lifeless corpse a few moments later his head is intact and there is merely a trickle of blood running from his forehead.
BaconIsMyBFF
27th Dec 2001
Correction: The head isn't exploding, the blood is just raining down on the camera.
The back of Mac's head was blown completely out, the shot following the camera being covered in blood confirms this and it also confirms that Mac's head was not entirely blown apart. The entry wound is small while the exit wound is enormous. This is consistent with how the weapon works when Blaine is killed.
BaconIsMyBFF