Really? Why would they have to shackle her legs? Was she going to out run the Marshals? Just more Baloney.

They get monitors. Ankle and boots to track their location until pick up time.

I have seen the video a thousand times since first circulated, BUT Not this one. The one was on for years, it is slightly different.
One of the body guards was moving in such a way blocking the camera.
As for the little metallic sound we used to joke with my friends that some screws loosened up.
This one is clearer, better view but still...
If I remember well this is the time she went to Chelsy's house and when came out was good as ever was looking even better.

You mean looked completely different 👊
She put on 20lbs during the 10 minutes she was at Chelseas.😂
#DoubleDanger

As much as I want to see this as an arrest with hand cuffs, I can't.

Her hands are behind her, yes. She's leaning heavily on the post trying to stay upright. Her hands do separate when she is assisted under her arms. There are no leg irons visible. The audible 'clink' could have come from anywhere nearby.

Why would the 'arresting agents' protectively surround her to block the view of camera's? If MI wants to arrest someone quietly they wouldn't choose daylight in front of cameras.

Any body doubles seen could be black hat rather than white hat. A double coming out a few hours later to cover up her incapacitation is the simplest explanation.

When I watch this I see an evil old woman with Parkinson's disease having a health event and trying to hide it from the public.

look at her right leg as she is being put into the van something appears to fall out of her pant leg and you hear the clink... I too don't see cuffs on legs or hands. but she is not passing out she is being forced.

Parkinson's disease? Kuru

I still cant spot that cuffs. Her hands came apart as the agent lifted her. She may had trouble walking on her feet so the had to “drag” her to the car.
There was no actual cuffs.

U can see the cuffs mate look again

She saw a ghost.

Yes she did and didn't want to get in the van. I can imagine the conversation with JFK once the doors closed!