One saying was pretty accurate... "I love the way you hate my guts, gritting your teeth, yet unable to do anything to me."
The sentence made complete sense when viewed in the context of the relationship between Qiguan Rang and the Red Lotus Group.
Qiguan Rang was a low-key person, but it didn't mean that he behaved low-key on the battlefield. On the contrary, he was rather high-key on the battlefield.
With him defending a city, the enemy couldn't even get water past the city gates and walls. With him attacking a city, one's defenses were basically useless.