Board Thread:Off Topic/@comment-25396609-20170201003940/@comment-27082610-20170306004600

This, apparently:

"Blake is the current Spring Maiden. Her predecessor was a woman of the Wukong family in Vacuo.

The reason Sun arrived to Vale with the Shade Academy students at the end of the first semester rather than with his team mates from Haven Academy is he was called to Vacuo by the dying Spring Maiden.

She, distrustful of the Brotherhood after what happened to Amber, entrusts Sun with the task of finding her successor. Thus, he is granted the ability to recognise the new Spring Maiden at a glance.

Sun recognises Blake as the new Spring Maiden at the docks, and decides to keep an eye on her until a good moment to reveal the Maidens Secret arises. This is why he tags along with her during the weekend she run away from team RWBY and why he was so shocked she was an ex-WF."