... that's a lot of speculation for one paragraph. What about the various anti-magic abilities that mages can learn in DA:O? None of those are based on blood magic, they are merely another form of energy control and disrupting interaction with the Fade. I have no doubt that the Templar's abilities originated from magic, but there is no evidence of a link to blood magic. Assuming that it might be the case does not make it so, especially when a more logical alternative theory is completely ignored.
Also, red lyrium has nothing to do with Templars or their abilities... Bartrand was not a Templar but was corrupted and empowered beyond dwarven norms by red lyrium.
I didn't say its related to blood magic, I said its related to demons. In other words I said there is high chance Templars learned their skills from fade denizens.
Demons, particularly pride demons can dispel and interrupt magic like the Templars and use the same "techniques". This is not speculation.
Also I didn't say Blue and Red Lyrium are exactly the same but they are fundamentally the same chemical, one is just much more potent. A good example would be seeing blue Lyrium as a spirit and red Lyrium as a demon. The latter is always dangerous but the former can be dangerous or useful or both. Justice is a spirit yet he did things that many call him demon (he is recognized as a spirit by a demon in the fade and unlike demonic abomination who are ALWAYS red he is blue which is kinda ironic in this example so fundamentally he is a spirit but does "demony" things). The point is I wouldn't be surprised one bit if this was true given the circumstances.