Unexpectedly, detective Cantin will enter the room right after the forgery. Regardless of the chosen dialogue options, Kate ends up with plastic handcuffs and will be confined to the room.
You need to find a way to remove the handcuffs. Begin by locating a bottle found on the second shelf of the metal cabinet. Once you're approached the cabinet, cast it down - unfortunately, the impact won't shatter the bottle. In this case, approach the lamp found on one of the edges of the table.
The lamp will fall onto the bottle and shatter it, leaving a few shards on the floor. When Kate attempts to get rid of the handcuffs, choose one of the shards which are located next to her. The sharp item will be enough to remove the handcuffs. Leave the room and approach the police officer by the roadblock to show your pass.
(Reaching Valsembor is rewarded with a new achievement - The castle).