Yep, I tried putting the blue flower as close as possible to the 2nd police and then somehow he jumped to the pit. It's hard to do, but it's possible. If the player put it too close, the police will just ignore it and turn around. But, if the player put it too far, the police wont jumped to the pit. To make it easier, you can adjust the player position by going to the pit first and then turn around. I think it will make the player get positioned on the 1.2 block(?) and then you can just put the flower at the right timing when the police came.
I hope this will help you to replicate it XD