Its a conspiracy Dave - they're all out to get you
I reckon good skills to the marshall - after all, he managed to accurately kick your car out of the ball park - and the way you drive matey, that's no mean feat -
In all serious now - it's impossible to say whether or not he was paying attention without actually being there. What is more feasible is that he made an initial misjudgement - which fortunately didn't end up in an injury - and then compounded it at your unfortunate cost.
In an ideal world, the marshal will make accurate split second judgements, not endanger themselves and not impede others but just as in racing (assuming the marshall was concentrating), he has to make a split second judgement call and in this instance, it went horribly wrong for you.
Obviously, the more feasible explanation is that he just didn't like your shell dude