Because Va'al wanted to see Skywarp push Shockwave down the stairs again.
"Retrieve the Omega Keys!"
"I don't quite understand how this could have happened."
"And yet, it DID! Can you imagine my horror? There I am, minding my own business, when my arm just falls off! Clearly, Megatron inflicted more damage upon me than you realized, Doctor..."
More to come...