У вашего броузера проблема в совместимости с HTML5
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0:11 - Siren scream damage variation
0:24 - Locking the damage value per tick by not moving
0:47 - Taking 0 damage per scream tick
1:03 - Bug : Siren scream breaking.
Playing around a bit with the Siren after TCREngineer linked me his video of the locking of the damage by not moving. When the player doesn't move, the scream damage seems to only calculate from the original positions.
The bug just came about after I was playing around with the fact that the Siren gained her ability to instascream again.