Black King Bar < Rage?

I'm almost 100% sure you can't Shadow Strike a raging Naix, and I am sure that Omni's ams stops it too...but earlier today I had Panda with BKB, and was being hit by both Shadow Strike (QoP) and Viper Strike *during* avatar. Not 'poisoned before avatar' or 'missle in flight', I'm talking FOR KHAZ MODAN! ... 3 seconds pass ... Stung ... lose 525 hp and slow as hell ... 2 more seconds ... avatar wears off.

I know you can Finger/Laguna/Cull etc a raging naix and deal zero damage, but I had never seen Avatar do flat-out NOTHING to stop a spell...especially QoP's non-ult non-finger-based thingy...

Anything else get through bkb that can't get through Rage?