Well electrified water is not all that good as far as they have magical armor still... so you might wanna think about that aswell.
As for almost pure ranger, I would indeed go for warfare and scoundrel (scoundrel for teleport aswell, because its better to have two together with tactical retreat, and for adrenaline rush, which really helps).
What I would REALLY recommend is pyro1 (on both of you), so you can use haste and piece of mind (it is really good buff, especially wits part of it). And when already having 1 lvl of pyro, you can also use atleast searing daggers+pyro to ignite flammable surfaces

When your huntsman is 5 points atleast, I would then probably just go for "ranged" - same increase in damage, but critical chance on top of it.
And after that, few more points in scoundrel, for higher critical multiplier and movespeed.
Stats would be finesse and LOT of wits for initiative (key for ranger!) and crit chance. Talents probably lone wolf, hothead, pawn, arrow recovery, also one of you should have petpal.
The goal should be as high single target damage as possible, with great damage types versatility thanks to some piercing skills, elemental ranger skill and different arrowheads, while always having mobility skill at your disposal, few buffs and debuffs from arrowheads. Remember - ALWAYS BUY ARROWS, whenever you see them.
Of course 1 point in hydrosophist can help (rain+heal+magic armor mby), but is not your focus, and with just electrified water you wont do that much (unless your friend is fullmage to break magic armor