That's about the only useful thing you do. Nova bomb them hobs after the first wave. Everything else would take you at least 5 minutes longer if you didn't have sniper cover. I'll give you one example then I cba to deal with your ignorance. Hydras have rotating shields, its better to attack them from two angles then just one simple. Btw from my line of sight one hydra is dead 5 seconds after it spawns. You can thank me in game.