Tarn's got him there. He was just thinking about how he needed more nucleon, but he didn't think that making a deal with Tarn would be one of his greatest of decisions. In fact, he was fairly certain that would rank up as one of his worst. Still, he itches to have supplies. Tarn might see him visibly hesitating.

"A lot. If you go around waving a gun or cannon around Megatron's certain to know where it came from."

Brainstorm's also quite fond of his comfort. If he was thrown out of his lab, then anything Tarn could offer would be worthless anyway.