[GAMEPLAY] Sion's Decimating Smash occasionally resets large monsters after leash

This has happened to me a few times. I believe this happens after the monster quickly switches targets and loses patience fast, but even if there are no other targets to attack other than Sion, it will lose patience. This even happens while the monster is in mid-air.

1. Have the monster quickly change targets, lower its patience quickly.
2. Use Decimating Smash on it. http://plays.tv/video/58f6aa2ea1734b538c/sion-bug