Refrain From Chasing When In PvP Mode
Stop diving. I understand that Marquis has, like, no health, but if you chase him, you're going to get hit by that Thumper Turret, which is going to slow you down and let the enemy team chase you down. It is much better to stay alive than risk getting killed. You've won the fight if you pushed them out of the lane because that means there's one less person able to stop minion waves from coming in. That means if they have another person trying to block minions from coming in, you'll be able to harass them a ton and, who knows, you might even generate a kill from that.