Zilean Bomb interactions

I can't confirm, but in an ARAM I noticed my bombs on Zilean were interacting oddly with Syndra's orbs. If there was an orb anywhere near the bomb, the bomb disappeared. No explosion, no damage, just gone. It didn't matter if the orb was first or the bomb was. This was confirmed by one of the enemy players as well. I don't know if it was just bombs on the ground, or bombs attached to bodies as well, but I'm pretty sure it didn't matter.