Sherlock swallowed then reached for the cup, taking it into his own hands and making a face at the smell before attempting to drink it. He did as told despite the terrible flavor and the way it made him want to retch. He could feel his hands shaking. It could very well be too late for these measures but he was willing to try for John's peace of mind.

"It's not just about wanting to kill you. It's everything. Every impulse is... every train of thought has the potential to escalate to stupidity. That's why it's different for us. It's not specific to any one way of thinking." He gagged on the last swallow but made himself keep it down.