Compared to normal, on revengeance difficulty he takes less time preparing to grab you and fire goes in two directions now, and all other attacks takes less time to execute.
Whole battle is quite lengthy especially the parts before the actual fight where you can use only your fists, it takes quite a lot of time to take 3% of his health :)
As for the fight, being aggressive is actually good and you can stagger him which prevents him from casting annoying firewall and you can deal lots of damage if you kick him in the air while he is staggered, but you have to do it fast.
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