Yes, he really should have. But the shout did help, distracting some of the elementals nearest to Alfredo and getting them to turn their attention to him, trying to drive him towards the bars of the fiery cage.

Lea, meanwhile, took out another group, destroying some and sending others scattering away from his flames. A quick glance around then led him to notice Alfredo. "No you don't!", he said as he moved, lashing out at the elementals. One or two went down to his fiery Keyblade, but there were still more of them harrying Alfredo. And as it stood, he couldn't turn his fire on them more broadly without risking the boy being harmed as well.

"Alfredo!", he called. "Try and get behind something!"