But Hagrid catching Sirius as Padfoot roaming the grounds and mistakes him for a poor stray and his big heart just expands as he goes into animal rescue mode and what choice does Sirius have but to go with him? Hagrid won’t stop thumping his back and he means well but bloody hell it hurts. Hagrid tries to feed him some rock cakes but he’s just had a full meal at supper and, even if he was hungry, he wouldn’t eat that. However, he happily slops at the bucket/cup of ale Hagrid sets down. He sneaks away after Hagrid falls asleep and wanders back into the dormitory half sloshed.