Annabelle's Pet, help

[Serpentarius]

I hve been working my way through the achivements one after another, but i can't seem to figure out how to get this one, help qould be appreciated.

[ZP]

You need to ally with the anarchs and they will break you out of the jail in Chapter 9
Then Do Not save Prince Arundel (it doesn't matter if you go to the mansion with Ward or not, just don't rescue him)
When you try to attack the building with Ward and Sevinc you must stop Sevinc from pushing the detonator for the explosives

Finally when you leave the city with ward and Sevinc you must choose to go to Toronto

[Serpentarius]

thanks