Renji was used to the disbelieving looks. He got them a lot when it came to the matter of technology. "If you want to help the alchemists, you should talk to Colonel Mustang," he said. He pointed Roy out, because he was helpful like that. And because, just a bit, he thought it would be hilarious to see Roy and Hitsugaya deal with Ed.

...from a distance.

...a safe distance.

"All of us work together," he said. "We just have different specialties."

What Rukia and Keman were talking about, he mostly spaced out. He wasn't much for talking about magic. It barely made any sense to him. Which probably explained why he was just so bad at it.