[Suicide Junkie]

I believe the event horizon was referred to as an "energy barrier" as well.

Still, given FTL in realspace, the event horizon isn't a terribly important distance anymore. Just go sufficiently faster than light (so as to make outward progress), and you could get out.

Shooting at it is silly (since it is just a defined distance from the singularity, not a physical object). Replace "event horizon" with "geosynchronous orbit" and it should be even more obvious.

The only technobabble that would really make sense is an antigravity bomb.