Change

The three of them were so confused by Isiah's general appearance,  and also the power he was showing right now, and therefore the three of them knew that something was wrong, they just couldn't put a finger on it.

All they wanted  was to run away the moment they saw his whole body literally on fire, but they were too ashamed to do it.

Till the end, all they thought about was that they were better than him, he who never used magic his whole life.

Isiah kept on walking towards them very slowly, not because of psychological  additional factors to scare the shit out of them, but simply because his body wasn't in good shape, it felt like he was struggling to do a simple thing like that, but that angry look on his face was quite frightening.

" Stay where you are, you idiot !" Aaron warned when his last spell failed to hold Isiah back, he was too scared and it affected his ability to perform magic.