Rook's towers work with nothing really. They don't even work with Blade of the Serpent. Thankfully though, armor of vengeance doesn't work with towers or rook's archer towers. Black Hat Hedgehog (A.K.A - Awufflablehedgie) knows all of this because he's tested everything possible in the game.

Oh, no lol . They fire 12 arrows per second. Every proc in the game would go off constantly. Only true auto attacks can cause procs, which makes the Rook possibly the worst character for things like nature's reckoning. (Slow attack speed, it won't happen very often)

You are 100% correct.

You're a proc.

Proc isn't a race, it's a state of mind.

I didn't realize Proc meant Fight Club. I guess I need to watch that again. Science knows the 2nd time watching was totally different.

Science DAMNIT! You found me out.

Go pray to your Flying Spaghetti Monster

/* Tone indicating a lack of surprise at the depth of hedgie's Demiknowledge, said with a chuckle */

Haha, of course they do. 

It does. It may be that the cost of the slam was about the same as 75% of the total damage you caused.

Hammer slam I deals 500 damage in a small area and 100 damage in a larger area  for 360 mana

If you only hit one target directly with hammer slam I, you gain 15 mana.

If you partially miss five targets with hammer slam I, you also gain 15 mana.

One of 3 things happened.

1. You didn't hit many targets
2. You didn't get a direct hit
3. The buff wore off before you landed the hit.

I've seen Soccer with some epic boulder rolls to full mana.

So I did some testing.

1. The damage for Hammer Slam occurs before the mana cost is deducted. This means that if you do enough damage to fill your mana bar your end mana will be at your max mana minus the cost of the hammer slam.

Example:
You hammer slam for 1 million damage, your max mana is 5000 and your hammer slam ability costs 2000 mana. After the hammer slam you will have 3000 mana (5000 max-2000 slam cost).

2. Knock back deaths deal no damage and therefore no mana gain.

If you kill 1 million things with knockback, you will gain no mana. Units that can be killed via knockback are archers and soldier reinforcements.

3. Hammer Slam deals a knock back (or metaimpact event) first, then follows up with the damage attacks. This means that all warriors and archers you hit with the center of the blast will be killed via knockback. Only those units outside the knockback zone and within the AOE zone will end up giving mana.

4. Structural Transfer gives mana when used with the blade of serpents buff.