I have experienced a bug where the black hole wouldn't work when a projectile is barely in its radius. I am sure this is not just visual, because the projectile was fully inside the radius.
yes i noticed too,another really strange bug: if a shot stay in black hole radius for a long time without being sucked the shot would go off screen,and land on a random enemy
The problem is, I shot the weapon in an arc and with low power, so the projectile had almost no speed when it entered the radius. Plus, the black hole didn't glow as it does when being activated. Here is a link to what happened: http://plays.tv/video/5979bb37f342f713fe/the-black-hole-gave-me-the-win-by-not-working-?from=user
I did use a lot of power there, and I have a video of what happened (link here ). As you can tell from the video, yes I did use a lot of power, but the black hole wasn't even activated. Using a lot of power makes no difference in this because when the black hole gets activated there is an animation with that, and the only thing i can think of is that there is a VERY small radius inside the shown AOE of the black hole that doesn't actually have any affect on anything.