I know exactly what you mean. And honestly, yeah. I'm thinking this is a fake-out through and through. You've got two medical professionals in a cell where each bot is somewhat cleanly disassembled. Everyone's head is intact, and so are their chests. Also look, no bodily discoloration, and the page we see the carnage it says it comes "Later", implying Grimlock's been sitting in that cell a little while after doing the deed.