Concering a delayed reaction of the valiant crew man. Spock says that the Valiant was swept half a light year out of the galaxy by a magnetic storm. Kirk then postulates that the old impulse engines were strong enough. Meaning that the space warp engines were probably off line and/or damaged. Either way, the current of the magnetic storm was too much for the Valiant. Magnetic storms probably do not travel faster than light; so we can assume that the Valiant was traveling through the barrier and out to that 1/2 light year point at sub-light speeds. That's a multi year journey. I doubt it would have taken that long before the crewman manifested his abilities. We could imagine that after being thrown clear, the Valiant crew repaired their warp engines to return to the galaxy. Either that or they faced another multiyear journey back into the galaxy. It is stated that upon returning is when the ship encountered some unknown force. It then that the "seven, no make that six" crew members died. I makes me wonder if a sublight journey through the barrier would have the same disastrous effects.
In looking at the scene in question. Kirk says, "Helmsman, take us out of here." Mitchell then presses a few buttons on his penal. Dehner is then zapped, a second or two later Mitchell is zapped. Kirk then runs to the controls shouting "Helmsman! Lateral power." Spock then goes to the controls and takes over. I think its ambiguous enough for either of our opinions to be valid. It seems there was enough time for Mitchell to have started turning the ship around. Yet, it was only a second or two before Dehner got zapped. Arguably not enough time to complete a turning maneuver.
I'm going to stick with my directional theory.
In looking at the scene in question. Kirk says, "Helmsman, take us out of here." Mitchell then presses a few buttons on his penal. Dehner is then zapped, a second or two later Mitchell is zapped. Kirk then runs to the controls shouting "Helmsman! Lateral power." Spock then goes to the controls and takes over. I think its ambiguous enough for either of our opinions to be valid. It seems there was enough time for Mitchell to have started turning the ship around. Yet, it was only a second or two before Dehner got zapped. Arguably not enough time to complete a turning maneuver.
I'm going to stick with my directional theory.