We just stood still.
For this one, we slowly walked back
For this one, we slowly walked towards the sensor
We shook our hands quickly in front of the sensor
We slowly walked backwards, stood still, walked forward, and stood still
We walked backwards, stood still, walked back again, then stood still, proceeding to walk forward.
This was velocity based, we stood still, tried to walk at a consistent speed backwards, stood still, tried to walk forwards at a consistent rate.
We failed. lol