Thanks to Kpoplobster for walking me through this in game.
Upon further thinking about it, the bug stems from two things. One, people getting a rift key but not being in the trial rift. This allows the trial runner to endlessly get keys for the others (who in turn can return the favor). Two, it consumes the lowest rift key you have if you dont have a trial rift key. This means when you drop the trial rift key on the ground, you can just use the key you just generated form the previous run for others.
http://youtu.be/gsVKMQUbJxo
Developed a new way to do this:
http://youtu.be/fxILqYS5jPc
Requires 0 keys of any kind to open trials.
Upon further thinking about it, the bug stems from two things. One, people getting a rift key but not being in the trial rift. This allows the trial runner to endlessly get keys for the others (who in turn can return the favor). Two, it consumes the lowest rift key you have if you dont have a trial rift key. This means when you drop the trial rift key on the ground, you can just use the key you just generated form the previous run for others.
http://youtu.be/fxILqYS5jPc
Directions are in the description.
You don't need to spend any keys of any kind to open the trails.