Horrifying footage seems to show the thieves speeding down a leafy street in Hampstead, London, before ramming into the unsuspecting walker last month.
One man jumps off the moped, before kneeling to steal the victim's watch.
He then jumps back on the moped, before the pair speed away into the night.
The attack took place on Hampstead's Elsworthy Road last month.
It left the man with his foot broken in four places – but MPs want to ban cops from ramming moped thugs off the road in case THEY get injured.
Former officers have praised the hard-line tactic as cops bid to stop the violent moped gangs who have terrorised London in recent years
But Shadow Home Secretary Abbott described the tactic as "extremely concerning".
She tweeted: “Knocking people off bikes is potentially very dangerous. It shouldn’t be legal for anyone. Police are not above the law”.
But cops soon hit back at the Labour MP for Hackney North and Stoke Newington, calling her intervention “very unhelpful”.
John Apter, National Chair of the Police Federation, said: “My colleagues are doing the best they can to prevent robberies, violent attacks and muggings.
But former officers have praised the hard-line tactic as cops bid to stop the violent moped gangs who have terrorised London in recent years.
In response to controversy, Met Police Commissioner Cressida Dick said the approach has resulted in only a "very small" number of injuries.
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