Board Thread:Speculation House/@comment-33287020-20180410162106/@comment-33287020-20180411013407

If he does have that ability, imo I think he’d keep it secret at all costs because of the ramifications. If Salem managed to get ahold of him at this stage, or at any stage where he was vulnerable, she could force him to open every vault, and forgo the maiden hunt. That’s why it’s imperative to keep it secret. Waiting and getting the spring maiden is a safer way of doing it, in his mind, even if it means Haven gets destroyed, because it keeps Salem from learning she might not need the maidens at all.

If he used this power at Beacon to remove the relic from the vault, he could still do it under the cover of technically having one of the fall maidens at the time, so Salem would most likely just assume he used her to collect it.