If the Harry Potter 2 spider chase scene scared the shit out of you as a child, you could likely imagine the way Dante felt seeing all these spiderlings lunge at him while screeching, their mouthparts dripping with some sort of venom.
However, at a certain level of power, certain things that would frighten you before would not faze you. To Dante, these spiderlings were moving in extreme slow motion, the kind that made you impatient to see what happened next.
If he wanted to, he could charge into the army and crush them all using his power, but way the heck would he do that? Rather, Dante cast out his palm callously, sending a huge wave of potent hellfire towards the spiderlings rushing at him.
When the spiders met the wave of blackish-red flames, they immediately turned into charcoal without a chance to screech or make any death throes. Hellfire was not like normal flames, it was in the list of top ten fires.