When two anchors are carrying the load of 80Kg anything more than 90 degrees is not recommended.
I still recommend 90 degrees as it give you ample room to do one’s own thing
but 90 or less angle is better. So a relationship where each person is pulling at an angle of say 80 degrees results
in sharing the load of 80Kg down to 56Kg each. So if the fear is the load and weighs 80kg for one it will only weigh
about 63Kg when supported by two people at 90 degrees.
The load of 80Kg is then taken by one person when there in dispute with the other person actually adding to the weight of
the person on the right