What is Himura doing in the final page? Delivering an electrical shock (like a 'defibrillation') to restart Saeki's heart, or what?
Person under you said you're that's correct. She's using an AED (Automated External Defibrillator) which talks you through the way to set up to deliver a shock (to the heart).
I died when I saw that last panel, even the pad placement is accurate LOL