The concept of immutability on the pyramids prevents them from being changed by any attack including Salvos's powerful divine ability. This stall in the process increases the delay time for the divine ability indefinitely and will thus protect whatever is behind them.
Soverick just has to be able to anticipate when the attack will come so that he won't be overwhelmed by the divine ability. That is something easy for him to do. He can literally see the attack brewing before it is activated. So he was able to run and hide in time.
The second weakness that Salvos has is that he must rest his eyes for every second that his eyes are open. He can't keep his ability constantly activated. His eyes need to cool down after each use creating a window of opportunity for him to be approached.
