[Spoiler] Stuck at locked doors in "Now or Never"

Hi,


I'm stuck in the quest "Now or Never" (where you help Triss and the mages flee Novigrad) in the sewers.



I went trough the library, where I had to blow away the walls, and though the two-storie room with rats at the bottom.

The Corridor after that has two doors: one up the stairs and one strait ahead. Both are locked and I can't see another way out there.


The walktrough I consulted at eurogamer mentioned nothing about closed doors. Is this a bug, or did I forget something?


Please help.



Thanks!



I didn't find the right solution from the Internet.



References:

www.gog.com/forum/the_witcher_3_wild_hunt/spoiler_stuck_at_locked_doors_in_now_or_never

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