Most flawless triumphs ask the player to do the activity solo, or the activities don't have matchmaking in the first place.
Ruining flawless runs would be legitimate griefing. Getting goofed on in strikes is really not a big deal. Pull out your own sword and return the favor
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It’s annoying and if done multiple times in one match then yeah it is ruining game play. There is also the triumph for completing ketchcrash without dying so there is that as well. I am not one to do something to someone else just because they did it to me. It just needs to be fixed as it was not that way before.