RAAMtentacles says:
1). Would I be rolling at -2 for me or just -1? In other words, does the -1 on Agna effect my roll?
So this definitely not clear in the rules but, since the difficulty behind Agna's penalty still applies (you don't want to hit her!) I'd say it's -2 penalty to help. Having Str lv 4, -2 penalty gives you a modifier of 2, so that's 42% chances of helping!
Fizel actually can't help because he would have a negative modifier, but he can kill one hand (or the fish man) for free since he is part of the party (I have to set up his sheet again to roll for him)
RAAMtentacles says:
2). Would the fish man require just another hit to kill or would it be a crit to kill?
the fish man dies with 1 hit, but since there's no actual difference between the enemies as far as the rules are concerned (they don't roll!), I switched it simply because it felt anti-climatic 😆 They are all basically the 'same enemy' in different 'skins' so I opted for what felt more cinematic if that's ok (you need one success per enemy here).
If you think its confusing or taking your agency away, let me know and I won't be doing that
very subjective call. I'm going with the rule of cool, but this might not be cool for you 😆