[Not only would it be a massive consumption of energy; if they really need Pteragordon into battle mode, it means things are wildly out of control.
Ian's already on his way out as soon as Ucchii mentions the trains, relaying instructions to Parasagun as he goes. Just the standard keep the base safe, take care of any enemies that come near that Parasagun already knows. It helps settle Ian's nerves a bit to repeat it though, and to receive the assurance that of course Parasagun will take care of things here.]