Chillmaw is a bit buggy. You can actually pull him from just about anywhere and not get attacked, sort of luck/randomish. Happened to me several times with no consistant pulling spot. At least, he will stop meleeing. He will still try and use his breath weapon, and the bombadiers can still get you.
Yes, but in that particular spot, you'll be lucky 90% of the time, or even 100% as me.
Updated a bit, added a 100% guaranteed strategy, all you need to do to make sure he will STOP attacking you, is pull him on my coordinates and keep stepping back till he stops (very small steps). Enjoy