It attacks randomly. And it's quite fast, so you can't outrun it.
1) As long as I don't take damage, or I take 100 damage (miss one attack), I just attack the jaguar.
2) If I take 200 damage (i.e., 50 HP left), instead of attacking, I drink a healing potion (+60 HP, to make it 110).
Am I understanding this correctly? Can Reven do the same now and heal himself?

В тихой однообразной жизни всегда так бывает: каждый отдельный день бесконечно долог, но месяцы и годы мчатся с непостижимой быстротой.
I wanted to offer you some flowers, but a crown would suit a princess like you much better
Смысл жизни в том, что жизнь на тебе не заканчивается