From a purely Taliban Leadership perspective, them leaving the Americans alone makes sense. However, you're going to have a lot of Taliban infantry on the ground, high on the smell of victory, with a seething (and based on drone strike numbers, likely personal) hatred for the Americans, in a position of power, watching a Marine QRF force come in with a "Plz don't fuck us up" flag at the lead. All it takes is one mistake from either side for an RPG to fly and then its all bets off. Hell, wouldn't even have to be a Taliban aligned fighter, just someone with an AK, tripping balls on Opium thinking the Americans are here to reinvade their country. Or hell, some ANA forces could see the American force as the opportunity they need to try and up the pace of the fight in Kabul, hoping to drag the US Military in to save their asses.
I can't speak at all to the likelyhood of any of these outcomes, but this is a very messy situation, with a very hateful enemy facing down an extremely paranoid, on edge military (Seriously, if any of those marines aren't worrying that the streets won't be *paved* in IED's by the time they show up, they're retarded), in a hot situation where both forces have been moving extremely fast with little time to collect and coordinate internally, much less communicate with the other side. There's so many ways this could go wrong, and very few ways that it goes right. And most of those ways it goes right relies on it going wrong and the other side not chimping out over it.