Meaning of いい具合に in this sentence


> はーあほらし なんか **イイ具合に** 緊張したのにさ まったく俺らなんで付き合い続いてんだろうな 正反対なのに

(since it's from a manga, I put spaces to indicate separated balloons)

Context: two friends have just had a discussion (as they often do) before a
decisive battle against their enemies. One said that he will stop his friend
if he tries to kill people during the battle.
[Here](https://i.stack.imgur.com/6liXM.jpg) you can see the pages in question
(the sentence with 具合に is at the beginning of the second page).

I found on a dictionary that よい具合に means 'fortunately', but it doesn't make
sense to me in this case. Even if I translate it as "in a nice way", I still
don't get the meaning. Could it be that the sentence is not connected to the
next one (まったく俺ら...), so I'm not getting the right meaning? My attempt:

> It's ridiculous. Even though we are tense in a nice way(?) and we are the
> exact opposite, why do we continue to be friends?




I doubt this いい具合 refers to the strength of their tension. I would say this
いい具合に means something like "in a way that is favorable/convenient to me". I
don't know if there are [sentence
adverbs](https://en.oxforddictionaries.com/grammar/sentence-adverbs) also in
Japanese, but this いい具合に here is semantically closer to "to my joy,"
"thankfully," "luckily," etc. いい感じに also has a similar usage. Such a usage of
いい具合に/いい感じに is fairly slangy.

Judging from the context, the guy in the manga seems to have said いい具合 because
he thought what happened before this scene that made him nervous (a serious
discussion?) was a good chance to build a better relationship between the
other guy.

Examples:

>   * いい具合にいなくなってくれた。  
>  Luckily they disappeared. / They disappeared at a convenient time (to me).
>   * (while playing a video game) よし、いい感じに死んだ。  
>  [The enemy] died (and that made me happy).
>

