Spear Enchantment: Ward

This is my open suggestion for an exclusive / counterpart enchant to the new Lunge.
Name ideas were: Ward(ing) Fortified, Rebuff, Guard(ing).

The idea is that this enchantment gives the wielder the ability to block, either similar to the Shield, or the disused Sword Blocking mechanic. Blocking consumes durability similarly to a Shield. I envision two different possible approaches to this idea:

Possible Function 1:
Blocking with spear prevents 75% of incoming melee and non-magical projectile damage (arrows, small fireball from blaze, etc), 25% of explosion damage, and 50% of knockback. It has a built in cooldown after dropping the guard (like after throwing an ender pearl) of 2 seconds where the user cannot begin blocking again.

Possible Function 2:
Blocking with spear functions identically to a Shield in regards to melee and non-magic projectile attacks, blocking all damage and preventing knockback unless coming from (Z/H)oglin / Explosions / Ravager. Reduces damage taken from explosions by 50%. Successfully defending against any damage with the Spear puts blocking on a cooldown, (like a shield hit by an axe), preventing you from blocking for 4 seconds.


Levels:
this enchantment should have 3 levels, with each new level shortening the involved cooldowns on blocking by a certain percentage. Perhaps 15-20% each?

Deployment Options:
I see this mechanic being bound to either "M2" (right click) replacing Charge Attack, or bound to simultaneous  "M1" and "M2" (right plus left click) inputs.