I'm not near that combat, so I really can't help..
But, I thought that you might want to know, in order to do 76k's now you need atleast 3 people.
JaGex had an update a while ago that basically stated, if you fight the same person after they've just died to you or killed you, you will get junk loot.
It was to circumvent all the 76k partnerships that would just stand in pvp for the sole purpose of 76k'ing, not actually pking.