Fully charged enchantments

When a sword is fully charged, it is capable of releasing the sweeping edge effect, which is helpful, but it also opens up a new realm of possibility with full-charge activated enchants, and I present some ideas that could be helpful or fun, not totally overpowering. Applying these enchants will deactivate the sweeping edge and can only have one per sword.

Beheading:
When an enemy is killed on full charge, there is a 50% chance of the enemy dropping their head.

Disarming:
When a full charge is released, it has a small percent chance to knock the item the enemy is holding out of their hand.

Uppercut:
On full charge the hit will knock the enemy 3 blocks upwards, such as vertical knockback.

Knockback:
This enchant should be made into a full-charge activated enchant.

These ideas can be changed in percentage or added to, I just figured these sounded the most appropriate to enhance gameplay.