Game of Thrones Catan: Can Othell move a road segment from an “interrupted” road chain?
No, Othell cannot move PlayerA's road segments.

Even though PlayerA lost their longest-road, they cannot move these road segments - because, as Othell's card says, "The road you remove must only be connected on 1 of its 2 ends to your own pieces. Ignore opponents' pieces when checking connections."