Dealing with the Torches is easy, as they pose little threat on their own. However, they must be dealt with quickly regardless, otherwise they will keep using Flare to either heal Gaist or damage Ryu, the former situation is the most likely. As they are a Flame element, obviously, Frost can shut them down. The best and easiest tactic is to use Accession with the Frost, Force, and Gross Genes, then use Frost Breath, since it'll hit all three opponents. One Frost Breath should be more than enough to smother them out, though in rarer cases two might be needed. Then the player can focus solely on Gaist for the rest of the battle.