Your presence of mind and savoir faire to handle the unwieldy participants is laudable. If you had buckled under the wayward behaviour of the participants, possibly the training session would have failed and it could have emboldened the participants to repeat their behaviour. Trainers in general are trained to handle urbane participants. However, occasionally few participants who are boorish or highhanded find their way into the classroom who derive sinister pleasure in derailing the session.
Even in normal circumstances few participants start unwanted arguments in the training and handling such participants is becomes a challenge. However, yours was far serious case than those type of participants. Still you did not allow few oddballs to hold the training session in ransom.
You deserve additional appreciation for sharing your real life experience. Training or consulting community not necessarily use this forum for the sharing their experiences. Rather they use this to promote either their business or get some advice from others. In contrast what you have done is to reveal the actual sequence of events that had taken place. Kudos to you!
All the best!
From India, Bangalore