I don't think crouching affects it. In my test I stood there at a much lower height and wasn't affected. Have your viktor stand up 1 step on the stairs and that room and have his ult go off and you won't get affected standing upright on the floor
The video makes it look more like you are permanently affected by the silence from attempting to pickup urn. The silence and the purple aura both begin before mina uses her ult.
Looks like we're missing part of an overhead barrier that should prevent you from making this jump, but you can currently just leave the map. You can jump off the far wall from this perspective to get to where infernous is and then leave the map from there.
Tested on most recent patch. This issue occurs if ricochet is bought before silencer. Purchasing silencer first results in the expected interaction where each target bounced to gets the same amount of silence progress
You are not lifted by mirage tornado if you have 50% or more debuff resistance. Easiest way to test is activate blood tribute and be hit by a mirage tornado.
Testing done in practice range, but for some players some of the time when firing a shotgun at 3+ enemies after purchasing the items ricochet and silencer it will give more silencer progress than normal, often immediately silencing the second enemy hit by the ricochet after the first shotgun...
Looks like Yamato has a short duration at the beginning of her ult where she can be stunned. It's really easy to reproduce with dynamo and yamato in the training range, but we managed to turn an ulting yamato into a bunny even and throw an ulting yamato with lash ult.