With the re-rolls, you roll all of the dice for 6s, then put any that miss to one side and roll the 6s again to try and get 4s. Any 4s that wound obviously wound and any that miss you add to the other pile. You then roll all of these again as if for the first time.
Basically, roll for 6s and the 4s, then re-roll everything that didn;t get a 4 on the second half. Hope that makes sense.
As for the bane/two-habded weapons, it gives you +1 to hit, which COULD be read as move it across by one on the table (although it shpuldn't, lol
). I would presume that you add it to both rolls as you are adding one to the die. So, that would make it 5+/3+, but I could be wrong on this one (although I'm not on the re-rolls
).