If Pip is pressured, you might force him to use his Healing Potion on himself to survive or if he's playing selfishly. Cauterize helps alot in countering him.
Jenos' Void Grip can detect stealth. Even if the enemy Skye/Strix/Sha Lin Disappears S/he can still be void gripped since its basically auto aim. Use this when they try to disappear and Run away
If you see Terminus with Seris run for your life because that's a fight you cannot win the best strategy is to either lure seris away from terminus or kill her without terminus even knowing cause he'll try to block all your shots letting her escape
Learn how to bunnyhop and you can hop out when sniping the enemy Sha Lin across the map. It would confuse him seeing you flying up in the air and lunging across the map a pretty far distance. Learn how here: https://youtu.be/2rYToy5eUas?t=315