"Oh, you are hundred CS above Nasus? Shame your bot is losing"
Because not only you can't do anything to help them now, Nasus will take as much towers as he feels like the moment his teammates go help him.
Seriously, fuck this champion. Riot is all about "interactive gameplay" and somehow they still allow this walking freezing contest to exist. Better yet - they buff him in a way that makes him even harder to punish in any way. ATM, better half of Nasus' strength comes from reducing any toplaners agency on the map close to 0 just by standing there.
And than there's Quasis build. Which is SOMEHOW even less interactive.