Ray didn't want to risk leaving any of the four alive. What if one slipped through? If they survived and didn't even know who he was, how would they ever track him down for revenge?
Ray moved deliberately, already planning three steps ahead with contingencies for every possible surprise. Of course, the ideal scenario was to wipe all four out at once.
He noticed that one woman periodically tapped on the rocks and then listened intently, as if calibrating her position or checking her surrounding