Understandable that XSET would want a replay since they were eliminated so no blame should be thrown their way. Realistically, any team would take the chance in their situation.
However, this replay precedent is in the end a lose lose for both teams, especially XSET, since if they lose, they look stupid wasting time and if they win, then everyone, including their own fans and the entirety of EU, would think that the game was not deserved. Vice versa for FPX. The fact that Riot allowed this to happen puts everyone in a tough situation as a result of the smallest of bugs that has existed since Killjoy was introduced. Unlucky really