[gumpzilla]

This is obviously a pretty difficult hand to discuss without some sense for how button has been playing. If he runs bluffs a lot when checked to, which seems like you can expect it reasonably often in a shorthanded tournament, then I think this is a pretty good course of action. Button not 4-betting PF might also be meaningful, inasmuch as he might do so when he has a quality holding. All this is speculation, but I don't really see a sensible way to analyze this without that kind of information, so I'll just guess. I've definitely seen a surprisingly large number of people that can make that fold on the end, but of course he was probably behind. So why not let him bet again? The 3rd barrel is pretty hard to fire, so maybe he's not going to do it.