enderpearl cooldown

[Dave]

Hi, I need help with this. I have a pearl cooldown on my ffa server and it works but if you keep holding right-click on a player you can bypass the pearl cooldown.

Here's the code:

on rightclick holding an ender pearl:
    if {freezed.%player%} is not set:
        if {fighting.%player%} is true:
            if {started.%player%} is true:
                if {cooldown::%player%} is not set:

                    set {cooldown::%player%} to now

                    if {cooldown::%player%} is set:
                        wait 15 seconds
                        if {fighting.%player%} is true:
                            if {cooldown::%player%} is set:
                                send "&7You are no longer on pearl cooldown."

                                wait 1 second

                                delete {_time.%player%}
                                delete {_cooldown.%player%}
                                delete {cooldown::%player%}
                        stop
                else:
                    set {_time.%player%} to difference between {cooldown::%player%} and now
                    if {_time.%player%} is less than 16 seconds:
                        set {_cooldown.%player%} to 16 seconds
                        subtract {_time.%player%} from {_cooldown.%player%}
                        send "&cYou are on pearl cooldown for &e%{_cooldown.%player%}%&c." to player
                        cancel event
                    else:
                        set {cooldown::%player%} to now
            else:
                delete {_cooldown.%player%}
                delete {cooldown::%player%}
                delete {_time.%player%}
                send "&cYou may not use enderpearls right now."
                cancel event
        else:
            delete {_cooldown.%player%}
            delete {cooldown::%player%}
            delete {_time.%player%}
            cancel event
    else:
        delete {_cooldown.%player%}
        delete {cooldown::%player%}
        delete {_time.%player%}
        cancel event

I also tried with:

on rightclick on a player:
    player's tool is ender pearl:
        cancel event

Any suggestion?
Sorry for my english btw.