He reflects exactly the damage he would receive during those 3 turns he is active.
If the effect last two turns he only reflects two turns, if it last 6 turns he reflects 3 and after that when his effect ends you will receive 3 turns of dot like with every other hero.
Doesn’t matter, when he is active he reflects the damage he receives in those 3 turns.
No. Maybe there will be fiends who give you status effects in the future like there are now minions (bera)
It will, because you don’t reflect any status effects directly, you just reflect damage back.