@fraize @0x56
If two massive objects, with a singularity volume, collide, their cumulative gravity would not necessarily diminish.

So, the matter+anti-matter energy release would first have to overcome the collective gravity to have any explosion. And, it would have to overcome the time dilation within the event horizon to ever escape that same boundary.

Wouldn't that be why we've not seen evidence of any blackhole exploding? It might release that energy, but over trillions of years.