Cool Idea, i would change the Server Trigger, the way you are setting the Player’s Health on the clienside will get the Player banned from the server with some Anticheats.
I did not make any changes to the script its how i downloaded it but here you go
RegisterServerEvent(‘pvp-siphon:server:event’)
AddEventHandler(‘pvp-siphon:server:event’, function(killer, reason)
local src = source
if killer then
TriggerClientEvent(“pvp-siphon:addsiphon”, killer, killer)
end
end)