Ah, the lava and volcanism caused extinction were out in full force back then. The idea, that a large scale, energy intensive asteroid impact into a liquid body, may enhance vulcanism on the oppossing side of the earth, by virtue of a lava-shockwave tsunami from below was what came of it?

Imagine a spherical carrying medium, through which a circular shockwave races. At the other end, were it will crash into itself, it will create a overpressure spot.

The continued volcanism did prolong the hellscape making it the extinction event it was.