New MB Glitch?

pre-emergency patch... i was able to 1hko... sort of... with MB after it was below 50% hp... since everyone doing 2009 would take FOREVER to kill from 50%, the last time i saw was ~40% hp and it died 2 secs later... so i can be PRETTY sure i was the one who killed it... because i purposefully went close to it... since it can be poisoned, and stunned... and had a small HP bar above the head like any other monster... so i presumed it wasn't boss type... so i tried 1hkoing it with MB

now, i dunno... i was at typhon arrow raining so it doesn't apply... but i shall test it out...