If you assist x (so all have the same target) then

toon 1) /cast

toon 2) /targetenemy

toon 3) /targetenemy 1

toon 4) /targetenemy then /targetenemy again

toon 5) /targetenemy 1 then /targetenemyh 1 again


You will get 3 different targets for sure and probably 5 different targets.