Visible crew/equipment: You can see the wires attached to the fireballs Charlie shoots at the bad guys.
Visible crew/equipment: When Charlie makes the red handle of the tap fly off, in the stable, when it hits the wood you can see the black wire attached behind it. (01:38:45)
Visible crew/equipment: When Charlie is in the stable, she makes a big fiery explosion, and the three men in protective suits go flying through the stable doors. Long black wires are visible, connected to all three of them. (01:43:30)
Answer: Everything happened too fast for him to react, his powers were barely working, controlling only Captain Hollister. If he was at full power he could have controlled everyone.