Depends on your team, and on the other teams invader. In regular Gambit if you can coordinate to take down the witches, then focus on the primeval it's possible to win before getting invaded, but it's less likely than it was before the nerfs, thus the nerfs were to extend matches and give invaders a chance. It's different for prime, which is why there's so many invasions and multiple damage phases. They nerfed energy for primeval heals in Prime too lol. Invaders were doing too much damage.