You died in ~3 seconds, not 1.5 you need to pay attention to whats going on you died in 1.5 seconds but that BW had to spend at least twice that queing up on you, even if all the BW abilities were insta casts thats still 3 gcds to kill you. And he killed you bc for some reason you have less than 6k hp? You also are playing magus without the only good ability the class has which is Aegis. Every build magus has should be putting points in right tree to get aegis at least. That would tack on another 2 gcds that you would live. You also didn't pot, already I found a way to literally double your current health pool with just a spec change and using hp pots.
Also detaunt is cool