Fnatic: didn't care that much, they wanted to save strats and knew if they went 0-1 they'd get easier matchups. Their strategy worked so they're now in the last fase.
Vega: Already used all of their strats against Faze. Overrated bot team that only got praise because they beat Faze because faze didn't want to bother learning how they play because they knew they'd go trough anyway. Vega only wins because other teams don't want to play against agressive tryhards in pugs.
SK: SK played like bots, probably because they also knew they were trough anyway. They don't have much strats because felps is on the team and they didn't train alot with him so that's why they save strats against Faze