New spectator mode for duel matches?

Imagine you're watching your friends duel without having to disrupt them or anything.
As soon as duel mode came in spectating was my first idea ...it would really be wonderful ... People that boast and say they had killed someone in duel... With the spectator mode we would be able to witness it and therefore the game will have a greater sense of competitiveness. While in process maybe 2v2 and upwards matches could be arrange :) hehe I don't wanna implement too much but you guys get my point ... Duel mode can be 'spiced-up' in many ways.
IGN: Lkavv