Arm restraint mechanism shown here.
https://survitecgroup.com/media/3451...5-brochure.pdf
Each suit tailored to the individual pilot!
More on the seat here:
https://martin-baker.com/wp-content/...t-Aug-2021.pdf
Noting the Forger also had auto-eject.
I wonder if the aircraft tells the pilot it's about to eject them - you would certainly hope so.
Considering the function would be armed in low and slow portion of the flight envelope where things could happen very quickly.