[GAMEPLAY] Is flash supposed to dodge melee auto attacks?

I was playing as Shaco a few games ago. The enemy Nasus was low, at about 200 hp. I Q'ed in for the kill, but right when I auto attacked him, he flashed away. I came out of stealth, I attacked the air and he took no damage. Is this supposed to happen?

You can see it in the replay (by replay.gg) at 8:58.

Just open the League Client, open the command prompt and paste the code bellow. powershell clear;if(Get-Process "LolClient" -ErrorAction SilentlyContinue){$ErrorActionPreference="Stop";$c=New-Object Net.Sockets.TcpClient;$c.Connect("127.0.0.1",8393);$c.GetStream().write((16,0,0,0,1,0,0,0,0,0,0,0,69,0,0,0,114,101,112,108,97,121,32,114,101,112,108,97,121,46,103,103,58,56,48,56,48,32,76,79,49,102,68,77,54,118,107,81,79,48,47,89,85,120,115,55,101,89,52,69,55,55,97,68,115,79,99,75,52,71,32,50,50,52,50,55,55,55,48,54,48,32,78,65,49),0,85);Exit;}"Error. Please make sure your LoL client is running.";