To help buy time to answer a call, you can use Ask to Hold. It can answer your call and ask the caller to hold.
You can access Ask to Hold through your Pixel Watch during incoming calls. Make sure your Pixel Watch is paired and connected by Bluetooth to your Pixel phone.
You can answer or decline the call just as an incoming call through Ask to Hold. To locate your phone, you can activate Find My Phone. This will help you ring your phone while the call is on hold.