@DarthValtrex Are you sure about the circle thing? I'm fairly certain that it's not how the Pylons work, at least currently.
Patch notes from December 03, 2019:
The Pylon is now significantly more aggressive in the way it shoots down grenades. Rather than just identifying between incoming and outgoing projectiles, it now predicts the trajectory of grenades thrown within the interception zone and intercepts them if they will land anywhere within that zone. This means that no grenade can contact any surface within the interception zone regardless of the team, but players can fire grenades outwards from anywhere within the zone