for your information
HURLEY: Right, you were failsafing. Well, F.Y.I., the whole island vibrated. And Kate and Jack and Sawyer saw it, too, right before they got bags pulled over their heads.
Usually in the combination "to lay a cap on someone": to put an end to someone's life
"This was a man talking who'd just laid a cap on three people back there and he was worried about this guy breathing?" 'Deaver, Jeffery (2003): Twisted, p. 30' (lay a cap on)
