nothing scary about it.
Really? I counted about a 12 second float, during which he added more flaps. Now THAT, I have never heard of. You really should not change configuration so close to the ground like that.
I had never heard of retracting flaps while on landing roll until pprune...
You never did your PPL? I thought it was standard to retract flaps on a short field landing in a small aircraft. I would not advise to get in the habit of doing this in an airliner though.