The good vibes had to end at some point.

The stakes are real for both New York football teams now, with the playoffs feeling within their grasps even after the Giants and Jets both took losses on Sunday. That is why this Sunday felt more painful than the two-loss weekends we’ve grown used to in recent seasons, when both local teams were all but officially playing out the string by now.

For the Giants in particular — more on the Jets in a bit — this was a gut-check loss. We know that the analytics pegged their 6-1 start as lucky, and we know that it is hard to get very far by pulling off a fourth-quarter comeback every week. But the Giants did not even put themselves in a position to come back in Sunday’s 27-13 loss to the Seahawks, fumbling away a punt late in the fourth quarter that allowed Seattle to extend its lead to two touchdowns in a moment where that simply could not happen.

Brian Daboll’s group is still 6-2, still defying the gravity of expectations and still in a playoff spot as it enters a bye week. There are also still four games against divisional opponents — and two against the Eagles — left to provide a real test for a season in which the Giants have thus far caught lightning in a bottle.