Flying back from PSA to LHR on the delayed BA607. Travelling on three separate bookings with 2xGCH in club (including me) and 1xBlue in ET.

The friend in ET has not been assigned a seat and could not be assigned one at check-in which has raised concerns about her being IDB due to whatever.

She has a kid that she needs to get back to, I would happily spend another night and day in Pisa on BAs dime. However, if I tell the gate agents that I will swap with her will that mean I have voluntarily given up my seat and therefore not protected by EU261?