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The weight is slowly lowering towards the plate, and he has to stop it somehow before it they come into contact – the bolt will fire, Sarah's in its path.
What a lousy first date.
Then Sherlock comes, attacking the lackeys, outsmarting the semiautomatic. Then the spider comes, slips a silk rope around Sherlock's neck, and he's not going to rescue Sarah anymore.
But they're distracted.
John move as fast as he can, but it's not fast enough.
And John falls – tied, he can't get back up.
He can just reach it, and he kicks –
The bolt fires.
The Spider falls.