In the sequence bellow Chael Sonnen decided it was a good idea to go for the Thai plum with his back against the cage against a taller opponent with significant reach advantage. With your back against the cage, a fighter needs to put his hips at an angle and go for wrist control or underhooks to avoid the takedown. This is what happened:
And remember, this is not the first time Chael fell for this. Here he is against Rashad Evans.
Whenever I mention this problem with the plum, Muay Thai fans remind me how other fighters like Demetrious Johnson or others are successful in using the plum. Fighting with your back against the cage should be wrestling oriented. Generally, if a fighter gets the plum he needs to have space to pull his hips back to avoid takedowns and load his hips to deliver harder knees. This is not possible against the cage as your hips are trapped. To summarize, fighters should not go for the plum with their backs against the cage.
Here are the two examples side by side:
A single neck tie can give fighters an escape route by pulling the head to the side, but they should always get at least a single underhook. They should not try to strike and use uppercuts without an underhook. Instead they should work to get underhooks, disengage and stay away from the cage.
My original post: https://www.bloodyelbow.com/2017/7/20/15956234/defeating-the-goat-how-to-beat-jon-jones-part-2-mma-ufc-214-daniel-cormier