Why didn’t Levi inject both Armin and Erwin?


In chapter 84 of _Attack on Titan_ ,

> Levi decided to inject Armin with the Titan serum to have transformed the
> almost dead Armin into a Titan so he can consume Bertholdt to gain his
> Colossal Titan's abilities.

Why doesn't Levi just inject both Armin and Erwin with half of the serum each
so both survive?




A question that we should also think upon: Would Erwin have wanted Levi to
turn him into a mindless Titan just so he could 'live'?

Remember that _the Titan injection turned Armin into a Normal Titan, not a
Titan shifter_. He still needed to eat Bertolt afterwards. If both turned into
Normal Titans, only one would still be able to inherit the Colossal Titan.
_There has been no precedence in the manga nor a mention of an event where two
people inherited the same Titan powers_ but a person [may acquire multiple
Titan shifter abilities](https://attackontitan.fandom.com/wiki/Nine_Titans).

Besides, as seen in **Chapter 84** and to quote from the wiki, Levi himself
did not want to bring back Erwin, even if there was a way:

> Levi notes that Erwin became a demon just as they had wished, and that **he
> deserves to rest, rather than be brought back into their hellish world**.

So, no, only one would still survive.

