Just give him some of the hay instead of paying him. Not sure how much though, I'm guessing he cut it, turned it, baled it and carried it ? How many hours did it take him?
The field is five acres & I get enough (120 bales) for my two plus I pay him £1.50 a bale to bring it in & stack it & he gets the rest -200 plus bales ( record is 700 from that field but he prefers organic so it hasn't been fed.)
This year he decided to cut it with a four day dry forecast, luckily it was ready for baling Wednesday - he riffled it late morning & then disappeared. The forecast storms arrived at 5pm drenching everything.
I heard the baler at 6pm -he had started baling in the rain with hway so wet you could wring it out. I went out & told him to stop as it would rot but he was adamant it would be ok for hos cows. It was dry again yesterday afternoon & he riffled it again but left the baling till today after overnight drizzle.
None is suitable for horses and not through weather but idiocy.