What spell did Redcloak cast?

[Doctor West]

I bet that Reddie casted "Redcloak's Awesome Implosion That Last More Than One Round And That Will Moderately Injure on Failure", that has the word "Implosion" as somathic component.

Verbal. Somatic components are gestures.
Aside from that nitpick I have nothing to contribute that hasn't already been said: It works better as a story this way so the Giant fudged the exact details of how it works.