The first option is incredibly risky, it might end in the interruption of whatever the angels are doing or it might lead to a large death in his soldiers because they jumped head first into an unknown situation.
He decided not to take the risk. Victory is already in their hands, there's no reason to take risks. It's the gods that need to take risks, they have nothing to lose either way. He had them pressed against the wall. They have nowhere to go. They can't escape their fate. This is why they are executing this last-ditch effort.
The last ditch effort of a cornered enemy is mostly desperation but also highly dangerous. Many a foe has fallen to the desperate acts of cornered enemies. The moment when victory is about to be had is another moment when defeat is possible. So Soverick kept his guard up and decided not to interfere in whatever was going on.
