As far as I know, if you call Multicast replication on client, it’ll process only on client, but if you call it on server, it will process on server and all clients.
I’m not sure, but try to create a new event, which replicates on server only and calls your multicast Kill event, and make OnComponentHit event to call a new event (OnComponentHit->new event(server only)->Kill(multicast)).