He's reassured of any lingering worry about Furiosa with the way she interacts with the war boy that came to report. That she was concerned more with her crew's well-being over the more scarce supplies spoke well, giving him a good idea of the sort of person she was.

When Throttle noticed him, he gave a wry, sheepish sort of smile.

"Good to meet you, Throttle." Offering a hand to shake, preferring that to the odd salute that he knew was some manner of religious gesture. Once that was taken care of, he'd just edge back again, both to give Throttle the reassurance of his personal space, as well as to let focus go back to Furiosa and whatever he had to tell the woman.