The Restrained June

Lucius arrived in the laboratory at the re-education center, having left Kiana behind to perform the interrogation by himself. 

While he could have made her accompany him to observe the event, increase her exposure to what 'Asher' was actually doing, the truth was that she had already seen him torture the prisoners and do other gruesome things.

There was no tangible benefit to having her around for this too.

Kiana was not really necessary for this occasion and thus he opted to leave her behind.

Lucius walked in to see June currently restrained on one of the tables and she was still knocked out.

One of the reasons why he chose to prioritize the interrogation immediately was to ensure that June remained unconscious when he arrived.

It had given him the time to consider his options.

Lucius also preferred to be on top of things, not wanting to let work pile up on him when it was possible for it to be accomplished immediately.