A situation arose yesterday wherein a player with a fighter that had the Great Weapon Fighting fighting style rolled a '1' on his damage. He re-rolled and got a '2'. He re-rolled AGAIN and got a '4'.
That seemed odd to me, so we checked in the book and it said nothing about only re-rolling once. Not wanting to slow the game, I voiced my concern and let it slide (they were in a thug-fight so it did not matter in the grand scheme of things).
Then this morning I wondered it we had an old copy of the book or what we missed. Is there a rule somewhere that states where you can only reroll once?