Don't engage right away, see if there's a portal near him. If so, knock him away from it to prevent fleeing and healing. If your ult is up, stun him to prevent another portal and to protect yourself from Broadside.
Battering Ram. Engage with a kinetic burst loaded up so he won't be able to use his F immediately. Keep an eye when he teleports away, if its close enough re-engage with Shoulderbash and finish him off.