triple shot and incendiary arrows with critical hits

i would like to know if triple shot and incendiary arrows shoot different arrows

like "if triple shot does critical, is it 1 arrow doing that, or do all hits count as the same, and all critical?"

i know they trigger the weapon spells and such with 1 hit, but is it with critical hits the same?

good to use both skills in this question, as some skills see triple shot as 1 attack, but incendiary arrows as different ones
dont remember which skills see it like that, sry