Malcolm's phone suddenly pings with a text from an unknown number. "Shit." He shows Sherlock the text. "We need to tread very carefully." As much as he wants to storm that office and get Joan back, if they've got a compromised agent, Joan could end up dead.

"We... we need a plan." It's unlike him to say that, but Joan's life hangs in the balance. If he got seriously injured saving her, he probably wouldn't care, but Malcolm wants Joan out of there without a scratch on her. She means everything to him, and he wouldn't be able to live with himself if she got hurt.