Players should not be punished for things that they have no influence over. FPX did not do anything to cause the turret to fire behind it. Obviously this glitch is unfortunate for xSet, but by forcing FPX to replay the round Riot is punishing FPX despite them not intending any malice, acting unfairly, cheating, or acting unsportsmanlike. Going forwards Riot should adopt the rule of "Once damage has been dealt the round cannot be replayed, unless either of the teams break the tournament rules, or do anything that may be considered cheating."