Last night's episode of Grey's Anatomy marked a joyous occasion for the interns, who got personalized lab coats as full-fledged second years. Happy for all of them… except one. Shane (Gaius Charles) became a Debbie Downer once he saw that the embroidering elves had dropped off a coat for dearly-departed Heather (Tina Majorino), too.

He also vehemently refused to work on Derek's (Patrick Dempsey) service — and thus replace Heather as the neuro protégé — even after McDreamy assured him that he doesn't view Shane as a consolation prize.

So why is Shane so blue — even after the other interns have long since stopped mourning Mousey? Uh, did you miss his little machination in Season 10, Episode 1?

In that premiere episode, Bailey (Chandra Wilson) sent Shane to find Richard (James Pickens Jr.); and Shane, not wanting to do such a menial errand, delegating the task to Heather. Heather found Richard unconscious and rushed to his aid, too panicked and/or foolish to see the electrified puddle in front of her. The result? One fried Mousey.

As Gaius tells TVLine, last night's installment was only the start of Shane's guilty glumness. He'll spend the next episode in the dumps, too, obsessing over how his ploy killed Heather.

"We’ll have to see Shane balance that sort of personal trauma with how he does his job and falls in line at the hospital. It’s going to be pretty cool, pretty interesting."

When it comes to the interns, we'll take any and all "pretty interesting" stories we can get!

Should Shane still be kicking himself over Heather's death, or should he just get over it? Let us know your thoughts in the comment section below.

Source: TVLine

Dan Clarendon is an assistant editor at Wetpaint Entertainment. Follow him on Twitter and Google+!