Both are full powered. Geralt is allowed to use his magics and so as Corvo(if Corvo had some magics). Morals off. No BFR. Death or KO. Location in a Cargo Ship. Corvo is in inside while Geralt is in outside.
Who takes it?
__________________ "When I pick sides, I pick a winner. Every time." - Erron Black, Mortal Kombat 11
"To all visitors from Transylvania looking for the head of Voivode Dracula: Yes, we have it. Yes, he's dead. No, you cannot see it. No, he will not return and invade you again. It has been over thirty years, please stop pestering us."
Geralt has Ygni I believe, which slows you down if you step in the vicinity or on one of the glyphs. But Corvo can indeed stop time when his power is full upgraded, which Geralt has no defense against.
He slows Time down at lv1, but stops it completely at lv2.
He does, but they probably will not help him against Corvo's ability to stop Time.
Yrden actually I believe (at least in W3). Igni's fire.
__________________
"To all visitors from Transylvania looking for the head of Voivode Dracula: Yes, we have it. Yes, he's dead. No, you cannot see it. No, he will not return and invade you again. It has been over thirty years, please stop pestering us."