Skeleton and /replaceitem

Using the command /replaceitem on a skeleton produces an unwanted effect.
I'm using these commands on a clock.

/execute @p ~ ~ ~ execute @e[type=Skeleton,r=5] ~ ~ ~ replaceitem entity @e[type=Skeleton,r=1] slot.weapon iron_sword
/execute @p ~ ~ ~ execute @e[type=Skeleton,rm=5] ~ ~ ~ replaceitem entity @e[type=Skeleton,r=1] slot.weapon bow

When I get near the skelly, it switches the bow with a sword. That part is fine. But when I move away, it switches the sword for a bow (also fine) but what is the problem is that the skeleton never fires again after the new bow is in place.