Could you please explain some of the game mechanics?

1. It accumulates.
2. It is subtracted.
Don't confuse resistance and magic protection. Resistance gives a chance to completely deflect magic...

If it's subtracted, how do I understand this (in the pictures)? The golem has 75 resistance, and I have 75 suppression. Subtracting will result in 0... The hero is a standard Razak, version 3.0, and he has nothing for resistance or deflection. But almost 200 damage was dealt :(