Replay Code: HV77Q3 (starts around 2:10 and ends by 2:35)
After taking the Event Horizon power for Sigma in the final round, I ran into a bug when using Kinetic Grasp for the first time that match. After absorbing a large chunk of damage, I was able to use my shield and fire a few shots before my health bar began to rapidly shrink for a good 15-20 seconds, getting as low as 29 health before it randomly came back. While it was shrinking, I was unable to shoot or use any abilities and could only idly move around until my health bar came back.
Also around the 3 minute mark in that same replay, it looks like its about to happen again for a moment but quickly fixes itself. Seems like it could be an issue with the overhealth not being properly calculated by the power.