@tipak thank for the answer but the meaning of the question is another :P, you need to kd in 2 different position in 2 different moment with only 1kd skill rigth?
and...notice now...can you override the heal of kana without any enchant removal/interrupt? the damage output is sufficent?
(Help) Deep 1man/3heros
gasp10
tipiak
No you can KD him on the same spot, you just have to wait that he gets back in his feet to KD him again 
Exemple : both warriors sets recall on a caster far away and go on the left to aggro Kanaxai. One war does the first KD, breaks recall, the second waits that Kanaxai gets up and casts nightmare refuge, then KD him again and breaks recall. Then, you have both nightmares pops on the left. All team go to the right to aggro Kanaxai again and you can kill him quietly. His healing is only through nightmare refuge so you'll need an enchantment removal as inspired enchantment, then use spinal shivers and have your people attack him with polar weapons. Or just interrupt him when he uses it.
Exemple : both warriors sets recall on a caster far away and go on the left to aggro Kanaxai. One war does the first KD, breaks recall, the second waits that Kanaxai gets up and casts nightmare refuge, then KD him again and breaks recall. Then, you have both nightmares pops on the left. All team go to the right to aggro Kanaxai again and you can kill him quietly. His healing is only through nightmare refuge so you'll need an enchantment removal as inspired enchantment, then use spinal shivers and have your people attack him with polar weapons. Or just interrupt him when he uses it.