He takes an initial lucky shot through the FOW (nothing abnormal here, you can hear the T70 through FOW and taking attack ground shots is completely normal for the 1st...you see this all day on twitch streams of players attack grounding through that hedge). The lucky shot connects, now people seem to think the 2nd shot is very suspicious but it is not, when you hit something in the FOW through lucky attack grounds, the item you hit is momentarily revealed through the FOW (you can hear the *donk* of the round hitting).
I don't know what the picture of the "curved" shot is supposed to imply...are you saying he has some sort of aim hack?
if you attack by normal attack or auto and if that shot will hit.
whatever their move next your trajectory will curved and hit enemy unit .
I'm saying that shot is not ground attack.