Your Buffy the Vampire Slayer/Angel challenge in a can is:
Angel - depressed - letter
AtS - Season 5 - A Hole in the World - Angel
Angel sat at his desk, head in his hands. His depression was palpable, radiating off the vampire in waves. He was unapproachable, growling at whoever attempted to offer comfort.
When Harmony approached with his morning’s mug of otter blood, he picked it up and flung it across the room, blood splattering the rug like a Pollack painting.
He stared morosely at the letter in his hands. “Dear Angel,” it read. “Nothing like playing the roving hero. Europe has changed since I was last in residence. Thanks, mate, for the chance of an unlifetime. Buffy sends her love.”
Now he listens.