Redgrave's own voice is much deeper than Dante's is, not that he's being recognized as a part of him - or is he? Either way, he figures he should cut the purple lightning off before it gets to be too much trouble, and to do that means going for the source...

He spread his arms wide and conjures fire magic, through a giant ball of it forming in his chest and then exploding out of it, towards Alastor.