Theo was ready to sidealong Charlie if the redhead wanted him to, but he knew what it was like to be vulnerable and unable to do anything about it so he was ready to wait and let Charlie make his own choice about that so that he'd at least have some measure of control; if Charlie wanted to Apparate alone then Theo wasn't going to humilate him by saying he couldn't, even if he was concerned about that spell and Charlie's bad leg.
He was all attention when Charlie spoke and he was nodding before the other had even finished his request, that thing inside him telling him he had to make it up to everyone else for the crimes his dad had committed, for the sin of bearing his father's surname. "No bother." he said easily and then Apparated away immediately with the cut-off scream that was the sound of his Apparition. He appeared next to the club doorway and waited for Charlie to appear, ready to steady him as soon as he did.