Started watching the championship match. I realized that if Powlich had used knockdown and fireball on fellela instead of attacking the tanglevine, he might have actually killed it before it could do anything at all!
Since he had fireshaper ring on him, fireball would do 7 dice. fellela's enchantment is pretty much certain to be gator toughness, so 7 dice -1 armor is 6 damage on average, plus about 1.5 damage on average from the burn. Even if fellela survived that attack, she would be almost dead and probably would only get off one enchant. And if he had decided to curse her first, then it would be 8 dice and chance of burn against 8 life and 1 armor.