Visible crew/equipment: While Carol is at the admit desk, Linda returns to the ER, and as Linda says, "My Lexus just got snowplowed in; could I use the phone?" the reflection of the moving boom pole is visible on the partition.
Visible crew/equipment: Susan searches for a surgeon for Mr. Bozinsky's aortic aneurysm. When Bozinsky has coded, Bob cuts the man open, then does the cross-clamp procedure herself, and in a couple of Wendy's close-ups, the reflection of the boom microphone is visible on her safety glasses.
Visible crew/equipment: After Jerry shows Mark how to use the paging microphone at the admit desk, the camera dollies out just as everyone joins Mark for Carter's prank, and there's a director's chair, with a crew member (has a goatee/beard) standing behind it, that is visible at the left side of the screen.
Visible crew/equipment: While Jerry is watching TV news about the snowstorm, Mark asks him how the desktop paging microphone works. Then, as Jerry walks toward Mark, the reflection of the boom operator moving with the boom mic is visible on the glass partition.
Answer: A man named Paul Sobriki comes into the ER in the season 6 episode 13 " All in the Family." He is complaining of headaches, Carter and Lucy decide to rule out meningitis and do a lumber puncture. Paul struggles during the procedure and believes that both doctors are stabbing him. Lucy, who is interested in Psych thinks something is wrong with their patient mentally, but Carter is dismissive of her. She gets cross with his attitude and she calls the psych department anyway to have a look at him. Later on and near the closing 20 minutes or so of the episode, all the staff start playing loud music and get a cake which appears to be blue lol, together to party as it's Valentines Day, Carter returns from somewhere and asks where Lucy is. He goes to check one of the rooms for her and Paul Sobriki comes up behind him in the dark and stabs him twice in the lower back, he collapses and as he falls unconscious he sees Lucy on the ground also. In the next episode, Be Still My Heart (ep 14), Dr Weaver discovers them and all of the staff work to try and save them, whilst Carter survives. Lucy's wounds are fatal and suffers a pulmonary embolism as Corday and Romano try to save her. Carter is grief stricken and feels guilty about the way he treated her, he becomes addicted to painkillers and Benton, Greene all help him and book him into rehab.