How can I win against Finneas in the fist fight?

I managed to win this fight after a dozen more tries. The main difference to easier fistfighting opponents is the very fast punch he can throw, it's pretty much impossible to counter. The only way to deal with this is to constantly keep up a block.

What enabled me to win was realizing that even though you can't block a heavy attack, you can still counter it. I just kept up a block constantly to deal with the light attacks, and waited for him to do a heavy attack. Those are slow enough that you can easily counter them, and then hit him a few times.

Just dodge, way easier than blocking. Wait for him to swing, dodge, then fast attack twice. Then back off and rinse, repeat.

On the PC, hold the right mouse button to block the jabs. Then when he winds up for the big punch, tap the right mouse button. You won't see your counterpunch, but you'll see him stagger. When he does, hit him a couple three heavies, then back off and repeat. He won't throw those heavies if you're too close. But it seems no matter how far away he starts that heavy punch, a quick counterpunch (which you won't be able to see) will work.

I can second the dodge tactic, back up so he takes a big swing at you, counter, hit him with 2 quick punches, dodge backward, rinse, repeat. I just did it at level 13.

SPOLIER ALERT

Depending on the dialogue you choose, there may be a fight with 6 or 7 armed dudes and a boss like character. Luckily it takes place in a warehouse with some things you can climb on. The NPC with you can take out everything if you just get up and away from them. You can take pot shots with your bow/throw bombs/whatever. But you do very little damage if you do it at a lower level. Might as well just sit back and wait for NPC to take them all out.

I'm stuck at this as well. I'm level 5. I can't offer a strategy. But I have found a way to cheese him.

Retreat to the South-East corner of the room. There's a table and chair blocking the way, so try to move inbetween while holding the block button. Now onto the cheese. This area is your saferoom. You can retreat south away from the chair if you need to heal. Attacking is slightly more difficult, move up to Finneas and try to bait him so he's sort of between chair and table. Parry him. If you fail, retreat further in for Regen.

Happy cheesing.

Easy.

Hit him with strong attack once. Then as fast as you can, hit fast attack. Do this until you've healed. (he won't be able to punch you when you spam it) Then hit him with strong attack again.

Repeat until he's dead.