Because all Nasus has to do is.... Uh.. ... So when Fiddlesticks uses his drain Nasus can... ... Hrmm... --- "the point of war is not to die for your country, on the contrary, it's to make the other poor bastard die for his" -General George S. Patton
Nasus goes in to Q, Fid uses his fear, jungler ganks, fid gets dead.
If a fid is playing top and the enemy jungler isn't ganking the lane constantly you deserve to lose.
fid doesn't need to use fear use drain and he will naturally back off and recall enemy jungler comes fear them and walk away and if you get camped and your jungler isn't counter ganking or making plays somewhere else it is there fault not yours --- ....