[Archer doesn't speak for a long moment. There's really no way to explain what they fought about without going into detail. The relief is replaced with mild confusion, but Archer finally does speak.]

...We argued about the way I handled the attack on Goldenrod. I tried to keep him locked up - something I know he has an issue with - for his own safety. He obviously didn't approve of that.

[There's no way to properly explain it without making it sound like it's entirely his fault, but Archer still doesn't believe it is. Yes, what he did was terrible, but it was to keep Kimblee from getting killed or captured. It was for his own safety.]