moved to Minecraft help

GreenNovaOK so my account got hacked from the app I installed "cause I'm stupid" and I was thinking.
If I were to reset my password for Minecraft would the hacker "who is 90% logged in" have to relog from the launcher? I would test this out but I don't wanna get hacked xD.

Note* The application which he hacked me with is gone, I wiped my PC.

this makes no sense

If you reset your password, everyone on your account is logged out (that is, if they have an internet connection, which they would). The only exception to this that I know of is if they are in-game, on a server.. Though the second they log out, they'd need to relog as it'd check with the auth servers.

Also, there is no such thing as "90% logged in", you either are or aren't.

Actually, for online mode, if they detect somebody used your account before,
ALL OTHER devices that logged in to that account requires the password again.

I think, cuz I experienced.

Does this question make sense and nobody knows or does it not and I will explain differently?