I'll just continue to insist it's never a 4 on 1. And the way invasions are now the Sentry is useless. They mark an invader only doing damage to them. So either they get some wild lucky AOE grenade to catch the invader or they're dead when they engage. Invaders have so much power, shielding (even more now with their set) and constant element of surprise that it's ridiculous. It's stupid, they're terrible and that's my opinion. I literally hate getting killed by them more than any player in pvp because at least that's on more or less of an even playing field.