Wattson Main Explains How She Can 'Eat' Grenades
By Nathan Fusco

Newer Apex Legends players or those not sure how Wattson works may wonder where their grenades end up. Wattson is a defensive Legend who can lock down zones with her perimeter electric fences. She also has a machine called the Interception Pylon which works much like a Trophy System in Call of Duty. Flying objects like grenades will be pulverized, but there are exceptions.
According to Reddit useru/Jameso4e, who states they're a Wattson main with over 3,500 hours, the Pylon has two different zones. It destroys all incoming projectiles in one, and then it destroys everything else in the other.
You can watch a more vivid description below.
It's important to understand both if Wattson is on your side. If you're close to the Trophy, you can throw grenades outward toward your enemies, but if you move a little farther out, in the outside circle, your grenades will be destroyed as well. So be smart about your distance.
If you are in the wrong spot, you could waste your advantage and become pinned down.