Counter-heroes in duel mode (3.1).

Regarding the reflection of Vampire, it is indeed the case. Vampire is reflected, and not only by Vityaz, but also by Leto and Jalam.

To be more specific, is it only the 5th-level Vampire spell that is reflected? Or can all magic spells targeting a specific target, rather than an area, be reflected if the opponent is only Jalam (or any hero from the Academy with the Magic Mirror skill)?
And what about spells cast not by the hero, but by unit-casters?