Ember.js 2, many click, many relationships, how to handle many clicks?

I have these models:

Fight:

export default Model.extend({
  teams: hasMany('team')
});

Team:

export default Model.extend({
  closed: attr('boolean'),
  fight: belongsTo('fight'),
  players: hasMany('player')
}); 

Player:

export default Model.extend({
  team: belongsTo('team'),
    nickname: belongsTo('nickname')
});

Nickname:

export default Model.extend({
  nickname: belongsTo('nickname')
});

Now I'm in the fight page and I have a list of all the nicknames and with a click on each one I need to:

• if there aren't teams already in fight (this model) I create a team and after that I insert my player in that team;
• if there is a team already in fight and is "NOT CLOSED" I simply insert my player in that last team;
• if there is a team already in fight and is "CLOSED" I need to add a new team for this new player and all others new players until that team is closed.

Everything works with this code:

fight.get('teams').then((all_teams) => {
    let count_teams = all_teams.get('length');

    if (count_teams > 0) {
        let last_team = all_teams.objectAt(count_teams - 1);
        if (last_team.get('closed') === false) {
            saveNewPlayer(last_team);
        } else {
            saveNewTeam();
        }
    } else {
        saveNewTeam();
    }

    function saveNewTeam() {
        let new_team = store.createRecord('team', {
            fight: fight
        });
        new_team.save().then((new_team) => {
            saveNewPlayer(new_team);
        }).catch(() => {
            new_team.rollbackAttributes();
        });
    }

    function saveNewPlayer(last_team) {
        let newPlayer = store.createRecord('player', {
            team: last_team
        });
        newPlayer.save().then(() => {
            // handle aftersave
        }).catch(() => {
            newPlayer.rollbackAttributes();
        });
    }

});

But there is a problem when the internet connection with server is slow.

If I click many nicknames the code checks the actual status of the fight, it says: "No teams open (available) here, I need a new one" and as you can imagine (because internet is crappy) it creates a lot of teams with just one player, as many as I clicked each of nicknames.

How can I fix this?

I need something like a queue?

Maybe I can click one player and then during the check if I click again I can queue the next player? But I need to show instantly the list of players added.

How to?