good work, is that the Rheinmettal or Beretta version? I really wouldn't know. What's the difference between the two?
your standard london commuter takes on average around 6 seconds to halt, stow handle, zip up handle cover, lift luggage, move, this is then repeated at the other end of the obstacle (give or take half a second as unzipping is easier than zipping)
the ice windscreen scenario was merely a simile, i've never seen anyone do this in real life
can the suitcase/travel bag not be carried briefly with handle extended under the arm, in my experience this is the most efficient as it minimises the negative effect on momentum