Send both signals
On the church roof, use the mirror to signal the light between the towers, then the light on the pier. Keep aiming at each light until it disappears. After the second signal, the explosion confirms that the crew is moving.
Reach the roof
You need the grappling hook and mirror from the opening church sequence. Climb using the hook, move right after the first ascent, then climb the shorter section to reach the roof.
Signal locations and steps
- From the roof, look right toward the 2 towers and locate the bright point between them.
- Raise the mirror and aim at that point. Hold the aim until the light disappears.
- Look right again, toward the pier, for the second bright point.
- Aim the mirror there and wait until that light also disappears.
- Once both lights are out and the explosion plays, continue with Sophia's route.
If the objective has not advanced
Use the disappearing light as confirmation before switching targets. A brief flash while sweeping the mirror past the target is not the completion signal described in the written walkthrough.
Check that you are looking at the pier for the second signal, rather than returning to the towers. This is the church-roof signalling task; the later sphere and reflector rooms use different mechanics.
Sources and limits
The route follows Emina Zulic's AltChar mirror-signal guide, published August 26, 2026 and reviewed September 5. It supplies the climb, both target landmarks, disappearing-light feedback, and explosion confirmation. The collected research also records matching steps from Eurogamer's Ezra signal guide.
These written sources describe the launch sequence. Use the on-screen prompt for your input device; no universal controller button is assumed. For later rooms, use the puzzle directory.