Following rules can be hard when they infringe on your safety in the tree.
For instance, I'm tagged into the middle leader of a 3 leader tree, and I'm butt hanging the leaders on each side using my nylon loopstraps and a clevis, TIP above lanyard around the leader to be hung, rigging on and back cut made,
But I don't want to hang around on that leader when it catches that load and starts thrashing about, so prior to my finish cut I take my lanyard off that leader, make the finish cut, then float away safely back to the midleader as the butt hung leader settles down and hangs straight down, then I'll float back over and cut the branch free just below the strap, chuck the 2-3 foot log left hanging on the strap, put my straps away, move to the other leader and repeat the process, using only one TIP above at that critical catch point.
Having an escape route if something goes wrong sometimes trumps the 2 TIP rule on many occassions when doing strategic takedowns in my opinion.
jomoco