The DoT on Nautilus' W doesn't make sense to me. Why is it not instant burst?

When you look at Nautilus, you'd think that every blow he lands would hit like a truck. But then you get to Titan's Wrath and see it applies a DoT. To me, that seems kinda... strange. You'd think that getting hit by Nautilus when he's angry would hit you with enough force to bring down a building, but nope, he somehow inflicts a... salt-water burn? Is there a reason why the damage of Titan's Wrath isn't instantaneous?
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