For Rein, the best way to start off a fight with a pin, especially if it's on the enemy Rein. Whenever looking for a pin, try to look for charges where you're not going that far of a distance so that you're leaving your team. Like if the enemy Rein is standing right in front of the payload or is standing a couple of feet in front of a wall, then you charge the fuck out of him, do a fire strike, and a swing or two should kill him. Positioning yourself and getting the enemy Rein to walk into a position where it sets you up for an easy charge is key. If the enemy Rein charges at you, charge him back to stun each other and both of you get knocked down to the ground. Also, if your shield is getting low, try to put it away before it breaks. That way you still have a little bit of shield left to try and block an enemy earth shatter. Your shield will break, but you and your team will still be protected