Stun bug

When you are playing as Rek Sai against an Udyr, you have a massive disadvantage due to a bug. When Rek Sai goes near Udyr, he will be stunned. If Rek Sai is underground, he cannot stand up and cannot attack Udyr. Usually a rek sai would tunnel towards his enemy, knock up and then use his q and u to damage his opponent. Udyr has time to stun before that knockup, and after the stun wears off, rek sai is stuck underground until he moves away from Udyr.