While VeGo goes with his story that this is RDM. I will stick with mine. The time Spook had to respond to wether he was going to shoot him (Triggering a flight/fight response) was too little. Therefore us humans usually decide to attack when we're unsure what will happen.
Spook might've been pumped up on adranaline carrying such an expensive weapon to a fight therefore had even the less of a chance to think it through. I mean, situation was very unclear and when I looked at the video it first looked he shot you before I actually found the comment by Vego saying he did not.
Conclusion: Not enough time to respond.
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