On the server that I am making, we have keepInventory on (since it's an FFA server with classes, so we don't want drops) so to clear a person's inventory (and make him invulnerable at spawn) we use a rapid fire repeating system (clear @a[blahblahblah]). This should clear the person's inventory.

The problem we have is that the clear inventory does indeed destroy the items, but it looks like the person is still wearing their armor, which is extremely inconvenient for invisible classes.

Steps to Reproduce:
1. Turn on keepInventory
2. Set a command block with a rapid fire pulse (less that or equal to 1 redstone tick) to clear the person's inventory when at a certain coordinate
3. Have that person step onto the designated spot
4. Observe effects, but note that it's only visible to other players