Magnus can hardly speak against Optimus on this matter, considering he had done the exact same thing after the last fight with the Decepticons, but it's also going to take more than that to get him to back down on this matter. He lets the Forge set gently on the floor, managing to stand a little straighter and doing his best to hide any sign of additional pain.

"I believe Ratchet's efforts would be of greater help treating those with more serious injuries than myself. I assure you, I can manage until he has seen to the worst of our number." He didn't say outright that he felt Optimus fell in the latter category, but the implication was there.