While Abel still had the world stone fragment, he really had no idea what the energy inside was. It's not like he could supply his own energy into it, either, so the most he could do was to wait until it was recovered by nature.
There wasn't time for it, though. Wizard Malon would kill him as soon as the world stone fragment had lost the energy. Abel cast quick "instantaneous movement" and moved right onto Flying Flame's body. From there, he called all his summon creatures back into his portal beast ring. He was ready to run before Wizard Malon regained all of his strength since the Rogue's Encampment was, by no means, a good place to prolong this fight. It's not like he could trap Wizard Malon here till he died of starvation, either. The number of blue howling rabbits here could literally make up for an endless supply of food.