"We'll hose you down later!" Donnie shouts as he hops over and onto the back of the thing, grabbing onto armored collar of the mech as he braces his feet against its back. Now where's that panel...

The pilot knows way better than to get out of the suit. He's lost sight of the green annoyance, but he gives up attempting to get the armor to its feet in order to bring the other hand around to try smacking Noctis off.