Favorite parts of the episode:
1) "Now, don't freak out, but there's this guy standing at your bedside right now with a syringe."
2) The numerous cuts to Sinon's butt to try to spice up the explanations. I particularly liked the one where Kirito looks at it and then Sinon looks up at him and he smoothly redirects his gaze back to her face while continuing his explanation.

Mfauli, the murderer wouldn't actually be wearing a Death Gun costume, lol. That was just a visual representation based on Kirito's explanation.