Easily done, easily kept up. At any sign of a tangle or snag she diverts, the aim being an all but constant, uninterrupted pet. No significant force applied, but she keeps pressure roughly level with that of his head against her hand. It's meant to be felt in the scalp moreso than necessarily the hair.

"It's alright, you're alright, I've got you." Easy, short, truthful. Sensing an opportunity to repay a gesture, one brief press of lips to the crown of his head. "We're here."