Note the blue slide on the simunition handgun.There you go. Thanks for the clarification and reposting the pics. On a different note, it's good to use them using more realistic training tools instead of airsoft guns for training.
That’s a massively important safety feature for any force-on-force training because you want zero chance of anyone grabbing the wrong gun.
Nobody in that original photo looked to be carrying anything other than standard issue live weapons, so it should not be any force-on-force exercise or they are just asking for trouble.
Also, aside from the EOD, nobody else even have eyepro on, never mind full face mask. Again, not what you would expect from a force-on-force pre-game.