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I'm not saying he literally stopped the attack.
To answer my own question: he didn't attack because the peloton (I can't remember who exactly it was now, someone did say) told him not to.
Why did they tell him not to? Because it's considered bad form (by some) to attack when the leader of the GC has a mechanical.
Is it bad form then? Maybe, maybe not. One thing I can tell you for sure is that having Sky turn the Tour into a procession, again, is fucking boring.
So would I have rather Aru attacked? Yes. Do I think that would be unfair? Given the massive financial and other advantages Sky have, no.
I also think Froome deserves to be attacked. It's one thing for him to seem to feel entitled to the yellow jersey but when it spreads to the rest of the peloton that's a problem.
Especially if you're at home watching it.
How could Froome stop Aru's attack. He was back down the road. Only those with Aru could do that