Shield stopped a remote access program from running on your device before it could connect, and it's already been handled.
What this means
Remote access programs let someone else control a computer from a distance, and scammers often use them in tech support scams to take over a device. Shield noticed one trying to run and blocked it before it could connect. Nothing was accessed, and no action is needed from you.
What to expect
You'll see this event in your Activity feed. If you weren't expecting anyone to remotely connect to your device, especially after an unexpected phone call, treat that as a warning sign and don't give anyone remote access, even if they ask again.