Board Thread:General Discussion/@comment-27745396-20170109170254/@comment-4010415-20170113180848

For Blake not noticing Sun was following her: RNJR didn't notice Qrow was following them.

Sun probably kept his distance from Blake for a while, but then he wasn't able to do it as easily on the ship because he was forced to be practically in the same building as her for the duration of the trip.