How does Amon know about energybending? He was there!
Why does Amon not know about the chest-touching part of energybending?
He was standing behind Yakone and could only see part of it. The angle also implies that whoever watching is short. If that is Amon, could it be that Amon is Yakone’s son?
Explains his grudge, doesn’t it …
It would also make sense time-line wise. If forty years ago Amon was a kid, it would put him in Tenzin’s age range. Sounds about right to me, considering his voice and demeanor.
It could just be 3-rd person flashbacks, like Roku’s but it does tie in neatly with this (click for energybending theories). We will see :D
Thanks goes to falris for pointing me in the right direction.





