He would be sitting on a stool, in his workshop, surprisingly full of ducks, he hasn't noticed you yet, although it seemed he's working on something very dangerous, before you could speak, he would suddenly get up

"YES!"

he would exclaim happily as he presents a duck with a wizard hat

"IT'S PERFECT!..."

the duck would spit fire as his face would immediately go to disappointment, before his attention came to you

"Were you... Always there?"

he would chuckle awkwardly