As a long haul trucker, Bryce was never in any one area long enough to make connections, if he'd wanted anyone to be anything more than a stranger. That the safest way, but not for the reason Rod assumed. What did he know? Rod had never even had the guts to come out of the closet as a gay man.
Any involvement in Rod's problems put Bryce in risk of drawing unwanted and dangerous attention to himself. Some stranger's safety after witnessing a murder was not his concern. Would telling himself that enough times keep Bryce from getting involved?