he also magically grew his legs back? Like, didn’t Rouge cut them off last ep?

I believe so. iirc, that is why he drifted away from the ship, because his magnetic feet were cut off and that is what was keeping them on the ship. I think this has precedent though, because I think something similar happened in the fight from episode 1, where a limb was cut off, but then when they de-transform, it comes back. I am not going to go back and check though.