Dealpool is immortal why make a death battle between an immortal and normal person that's hardly fair
Well no, they're both immortal, Unless Deadpool uses his Carbonadium sword which kills anyone with healing factors.
It just takes time for Deathstroke to heal back.
He could get shot in the head and come back after like an hour.
"For me, revenge is everything, and failure is nothing." -Sasuke Uchiha
"Holding anger is a poison. It eats you from inside. We think that hating is a weapon that attacks the person who harmed us. But hatred is a curved blade. And the harms we do, we do to ourselves."-Mitch Albom