"Wait, no! You didn't play with the kittens what do you mean!?"
"I-I-I-I have to go-"
He was backing towards the door, posture rigid, moving slowly-it seemed like he was struggling a bit
"Seriously! Are you okay?"
"I-I'm...I'm f-fine-"
He struggled over to the door, muscles spasming
"No-No your not look at you-I'm looking at you right now and you don't look well!"
"J-J-Just...l-leave me alone-"
"But your not okay!"
"L-L-LEAVE ME ALONE!"
His eyes widened and he stepped back.
"Just g-go.."
He ran out, falling in the doorway before stumbling back up, stumbling away
(For reference, agitation and like-panicked outbursts are very common with dementia)