when you see trix shooting towards you and getting invicible try to shoot him(and make him vicible again after 500dmg)spray/shoot/splash dmg near the place he just turned his stealth on
Strix invisibility is good and gives him advance agnist any flankers trying to kill him but if you are playing as flanker take illuminate and take care of him easly when he cant hide from you
Ash's shield is very small and easy to avoid(it can even go throught you ) , when you buy cc immunity item(she will try to move you character), you can easly rush throught it and make it useles, then u can easy deal damage to her and finaly kill
Buck is a mid/good option for dealing with strix, Get illuminate and start searching for him, he can take you out in 3 shots if he can hit you while jumping, be as mobile as you can and use your net to capture him and kill him quickly