I looked around the Bug tracker and saw some champions may not work properly with health thresholds in Alliance Colliseums, however I just wanted to put this here as I found it happened in the most recent apex colliseum v. Air walker.
Latest version of the app on android 16 Samsung s23.
Boosts: Attack, Health, and Champion.
VIDEO:
Video 1
https://youtu.be/HM71pnBl5eYVideo 2
https://youtu.be/Tq2shr2o_Hk