Send Event When Two Objects Collide?

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I'm working on a networked game in which two players can collide and bounce off each other. I'm not really sure how to go about doing this, but as of right now I've got a trigger collider on each player, and a Bolt hitbox of the same size/shape. When a client begins overlapping a trigger, I do a test to see if there's a collision on the server.

So far that all seems to be working. However, next is the hard part: I want to send a reliable call that bounces both players away from each other based on the collision. I can't seem to get this to work.

My initial thought was to try and send a message to the server to tell it to bounce the hit player, and have the client handle its own bounce. But the message can't go through since I guess I'm trying to send a message from entity to server which isn't possible.

Does anyone have any suggestions on how I could handle calling the bounce function on both players after a trigger overlap?

Thanks!