I don't think it is intentional, but more like unavoidable. That shot needed to be seen, but during the filming, it got blood splattered onto the lense. Once the editing was done, it was too late to reshoot another scene, so they just used the one with the blood.
This scene was meant to be there. I read an interview with Mel Gibson where he says when he saw this shot, he liked it as it showed how brutal battles could be at this time, so he decided to use it in the finished cut.
I agree with Eddie because firstly, how could you get blood on the screen by accident. There is no where for it to squirt from. Having died in a film myself i know that blood isn't just sprayed about, it is controlled as best as it can be. Secondly it is too obvious to miss.
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