The "Friends" list is not enabled yet (still beta, its in game, its just not working yet) so the only way to group up would be to get in vent. I tried last night but both my guys are w/out even flashlights now... I snuck way into a base, even outran some zombies, but ended up cornering myself... Agro'd another zombie and tried to get away... Find a gun in a room, but get attacked before I could pick it up... frustrating... lol

There is a trick to melee'ing the zombies w/out taking damage too. You need to square up and stand toe-to-toe with them and you want to aim high, like the top of their head. If you have a space between you and the zombie you take dmg, if you are toe-to-toe you dont.