Feed the ADC to watch them tilt/int/ff

Got my ADC 8/1 within the first 10 minutes of game as Xerath support, just to watch them throw their lead and blamed it on Sightstone. I rushed damage first like always than I get SS. Says no Vision when I have placed the 2 free wards I do get and a Vision. No one else was buying vision or placing wards at all mostly. Sorry if I get you 8/1 in short time as lucian for you to snowball, blame yourself why you can't carry. Agree?