If I leave in the “Set Property (as knocked out player)” to subtract points but take out the "Set Property"to add points then no scoring changes happen after the first trigger. The trigger is still activated (the activity feed item still happens) but scores are not changed.
The first time it does the “set property (as knocked out)” as expected (subtracts a point from the team whose king got knocked out) and the “set property” trigger as expected (the team who knocked the king out gets a point).
After the first time it only does the “set property” trigger, and it does it for both the knocked out player and the player who knocked them out. (both teams get a point)
If I remove the “set property” trigger to add a point the score only changes on the first knockout.