Each box with a number is a damage step. A damage step is the amount of damage done by the hunters to the monsters in an arbitrary length of time.
The “Kala” table assumes the cooldown on the Armor Reducer is as long as its use time. In the actual game, I don’t think this will even be the case. The cooldown will most likely be longer.
This shows, damage step by damage step, that Kala doesn’t do jack for mid to high level players.
In the first “Kala” chart, the hunters do a damage step to health, then, while on cooldown, do a damage step to the armor. This goes on until armor runs out.
In the “No Kala” chart, hunters first work through the armor, and then are able to damage the health.
This chart also assumes the monster has half as much armor as health(most stage 3’s have around that much).
The silver box is the average damage done in a Stage One dome. For example, in a common silver/gold game, a good dome placement results in about 2 bars lost versus a Goliath. Without Kala, this would be the seventh damage step(result=~2 bars of health lost). With Kala, it’s still the seventh damage step(result= ~2.5 bars of health lost).
In lower tier games, hunters might not be able to get 7 steps in, but maybe only 4. In this case, Kala does provide some extra guaranteed health damage.
In conclusion, the Armor Reducer is more of a safety net, and won’t really affect high level play that much, only help low levels.
Ask me anything if you’re confused
P.S. I know this assumes quite a bit, but I think a lot is counteracted by the fact that the CD will probably be longer than it’s capacity time.