Yup, but already accounted for.
Minor Heal fixes 1HP per FP on a human-sized target, up to 3HP. Major Heal fixes 2HP per FP on a human size target, up to 8HP.
So, on the Size Modifier +1 Horse, it's 2FP/HP with Minor Heal and 1FP/HP with Major Heal.
Casting repeatedly on the same target in one day gives rapidly increasing skill penalties. One Minor and one Major can be done without penalty, though.
You've got 13 FP, 5 Energy Reserve and a 4 point powerstone. You spent 3 energy during the fight.
Energy Reserve regenerates at 1pt/5min, no matter what you're doing. Fatigue regenerates at 1pt/5min while you're quietly resting. Powerstones recharge 1pt/day.