2. Size modifier -/+4 per size cat dif
but when was the last time those giants ran from that charging PC (without magical help)? The only people that can do that are well seasoned barbarians whose rage is so fearsom that those giants quake in their oversized boots when he/she charges them. So the size modifier should come into account from small to large.
Grenna really enjoys using the end of her to get a point across. Lots of RP fun!