It doesn't look like a random combo, the guy started aiming (moving his crosshair) at the opponent at the exact moment the opponent started to approach the edge of the wall, as if seeing him through a fucking wall, and then the guy fired a ball at the opponent, again at the perfect moment, as if seeing him through a fucking wall and knowing perfectly when the opponent will pop out from behind the wall.
Something must have told the guy the opponent is approaching the edge of a wall.
You call the something a luck / random / feeling, while I can buy it in many other similiar cases, I don't buy it in this case, too precise timing corelation of moving the crosshair, if he had moved and set his crosshair sooner or later, I could buy it.
Ooper said the something was another grapple sound, which Ooper needed to spend a long time in a video/audio editor to notice it, and tells me the guy noticed it in a matter of several seconds, and was able to distinguish the two sounds easly, and all this wihout a video/audio editor. I don't buy it, nor buy the guy has ears like a bat or like a sonar of a submarine.
It definately looks more not random than random, very suspicious.