No Privacy
At first, Credence loved his familiar. The cuddly little chick had befriended him a couple of years ago, traveling the world with him as he searched the streets of Paris for clues about his family. Back then, Credence had to carry the little fellow everywhere he went, keeping the bird out of sight in a shoebox, or gently placing the creature in his pocket before departing with Nagini. But now that he had grown, Credence's familiar had started following him everywhere.
The bird perched itself on the headboard, shedding ashes all over the bedsheets during the night. He followed Credence downstairs in the morning, scattering ashes at the breakfast table. He even tried following Credence into the bathroom. And that was just plain awkward. Sure, he loved his familiar. But Credence wanted some privacy while he was using the facilities.
One morning, after indulging in a particularly large breakfast of oatmeal, fruit and toast with peanut butter, Credence started feeling sick to his stomach. Groaning, he leaned forward in his seat with his arm curled around his waist. The nausea and stomach pain that he had experienced on occasion was becoming much more frequent nowadays, and within a matter of minutes, he had abandoned the breakfast table and made a run for the bathroom, his phoenix following close behind.
He was in such a hurry to get to the bathroom that he accidentally slammed the door in Fireflash's face, not realizing the bird was there in the first place. The phoenix hit the oaken surface with a resounding crack, ashes and feathers scattering in all directions. His beak became impaled in the wood, his wings spread on either side of his smoldering body.
When Credence emerged from the bathroom several minutes later, he found that his phoenix was still stuck in the door.
Grindelwald walked by at this particular moment, observing the bird as he struggled and flapped. "I say, what is he doing, Aurelius?"
"Uhm..." Credence looked at the bird, then back at Grindelwald. "Maybe he thinks he's a woodpecker, sir." A sheepish grin formed on his lips. Yes, of course the bird had decided to be a woodpecker. That was the perfect excuse for why his familiar was now frantically trying to free himself from the bathroom door.
The dark wizard considered him for a moment. "Well, I certainly hope so, Aurelius. I haven't had a nice piece of wood or decent pecker for a long time." He then continued on his way, leaving Credence to scratch his head and wonder what he had meant.