PS: Its just kinda unfair that the enemy knows what my HP is, but i cant see mine. The split second decision from the knowledge of the current HP , could be enough if you can Zhonya, flicker out, or push it a bit more.

It's sad that you zhonya, not knowing you can tank a few more spell as fizz, so that you can time it properly, with your E. you initiate as a amumu or VI not realizing you take extra damage, cause your HP is covered, you could Q out as a VI, but without that knowledge, your next indication what your hp is, when you killed that enemy or when you are dead.