The others were a little too far to see just what was genuinely happening. They stood just outside the booth and were watching from both sides. One side, with Quinn's group on the left and the other side with Zac's group.
Each of their team's stood behind their teammates, which meant Quinn had his back facing against Fex, so even with his excellent eyesight, he didn't know what was going on and was unable to see that the influence skill was currently active.
Quinn had never even thought about using the influence skill to get rid of this whole matter. Zac Being a level 6 ability user usually meant one would have a strong mind and will power, this wasn't always the case but more so than not. In the past, something like this would have never worked.