Confused

[oneonone]

Originally Posted by NIump50

Once the runner touches home, he cannot retouch and go back to third.
A tag of third is an out. after the ball goes into DBT it creates an appeal play situation. Run scores if defense does not appeal properly.
And runer on first does go to third.

After touching the plate the ruling that he may not return to third...Is this ruling unique to the touching of the plate. lets say R1 was on second, doesn't tag up and makes it to and rounds third before realizing the catch. Can R1 retouch 3rd and go back to second?