I believe Ridryder was making reference to the Medic on the call and using it as an example of how to tread carefully in your workplace.
Remember, we are hearing your side of the story and are absent of the Medics side to see what he saw and thought. Don't assume that you know everything and start blaming them for being wrong. Maybe in this case you were right, but what about the future? You had better be damned sure to be 100% correct to challenge them to their face. For example, you felt they were in atrial flutter but what if the Medic said 'no, it's a-fib' and he has a history of this based on his medications (first clue is he is on blood thinners).
As for going around behind their back, it sounds to me like the guy admitted he made a mistake and attributed it to work load. Can you tell me you have never taken a short cut or not done something for a patient for personal or selfish reasons? We are only human.
To be specific, there is nothing with the first patient that screams out at me that this needs ALS intervention. Weak and dizzy is a very common complaint amongst the elderly and the majority of times it is very benign. Could also explain him being pale, 'shaky' and the elevated BP, due to the catecholamine response.
The second patient sounds very vague. In the end, what is it you expect? So if they were wrong not putting O2 on, why didn't you?
Something else to consider is, what are the ALS resources like in your area? For example, what is his train of thought to tax resources that don't absolutely require ALS in the event a cardiac arrest comes in or an MI? It's also about triaging and prioritizing.