When commenting it would be nice to see the comment you are commenting against. Often they are long with several points and you can't refer back to it

You can close your comment and reopen it.
The text gets saved.

Not convinced, from a UX point of view that's pants. You're forcing the user to do something unintuitive

Like it
@dfox

I don't see where you would put the other users comment. If you had to close the keyboard to see the comment then you might as well keep it how it is.
In addition, if you choose multiple people to reply to, which comment will get displayed?

BTW how do you mark others with the @ ??
noob here, don't kill me

@RodrigoF in the bottom left corner of every comment there is a reply button. :)
Don't worry about getting killed we are neither GoT nor SO. :P

@vringar perhaps a split screen you can scroll independently?

@dan-pud exactly what I was gonna suggest