While I might agree the shoulder charge is a bit of a bitch, if you can't kill a Titan inside a bubble, you have some troubles. The bubble can be ignored. We call it grenades and shotguns. Run in, throw grenade down, shotgun him once, escape if lucky. Grenade should ensure either vacating or death. Titans are realistically fine, and this is coming from a Warlock. Yes, the FoH gets old and annoying, but I'm willing to not scream nerf when my Nova Bomb does something partially similar, but I can do so at a bit of range.