Kirk went to find Sam. They had things to talk about.

After asking the computer were his brother was, Jim went down into the shuttle bay. Why Sam was down here he didn't know, but several thoughts like 'good he's leaving' went through his head.

He went silent as he came into the bay, just listening, wondering if he could hear Sam. When nothing came to his ears, he silently began to check from each shuttle to shuttle, making sure his steps wouldn't echo.