The underlying truth?

From that point on, it was truly a one sided affair. Zinbad was clearing the house singlehandedly. And this just made the vampire even more confused. 

"Why didn't you juste nter the fight before? I mean, you could've avoided Tanya getting beaten up like this." Ambrogio spoke.

"Well, I could've. But, imagine this. You are fighting your mortal enemy and someone else enters the battle and says that they will fight on behalf of you even though you haven't asked them to do so. What will your reaction be?" Zinbad asked.

"I will be legitimately pissed off. I mean, I'm fighting my—ah, I got you. I get what you meant now." Ambrogio nodded his head as he said that.

"So, yea… I couldn't enter the fight until now. And I didn't expect to overwhelm you like this as well. So, there's that as well." Zinbad shrugged.