My first P2 impact test code....

p2-test.js

this.p2world.on('impact', function(evt){
    var playerBody,
        currentPlayer = this.state.players[client.sessionId];
    
    console.log('Body positions: ', evt.bodyA.position, evt.bodyB.position);
    
    if (evt.bodyA.hasOwnProperty('playerId')) {
        playerBody = evt.bodyA;
    } else if (evt.bodyB.hasOwnProperty('playerId')) {
        playerBody = evt.bodyB;
    } else {
       console.log('who the fuck is moving???');
       return;
    }
 
    console.log('Player ID:' + playerBody.playerId);
    playerBody.velocity = [0, 0];
});