execute as @e[tag=skullarrow,type=wither_skull] run scoreboard players add @s timer 1
execute as @e[tag=skullarrow,type=wither_skull,scores={timer=70..}] run kill @s
execute at @e[tag=skullarrow,type=wither_skull] run particle smoke ~ ~.5 ~ 0 0 0 0 1 force