Where's the Next Throw-In?

[Camron Rust]

When this came up in the past, I came up with the following argument:

What if the player that touched the ball while standing on an OOB line was a defeneder? Would it be a violation on the thrower? If so, the defense would only need to touch the ball to get a violation on A. However, the throwin requirements don't differentiate between a the offense and defense. This has to be a violation on the person who touches the ball while OOB, not the thrower.