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The two guards look tired and anxious. They nervously hold their royal halberds in front of themselves, using the weapons to push away anyone who comes too close to the gates. An angry woman attacks one of them, pounding his chest with her clenched fists making him fall against the other guard. All three collapse in a struggling heap of flailing arms and legs. Seeing your chance, you dash forward and pull the large lever which opens the great doors.
You slip inside and the doors close without either of the guards seeing you enter.