If a fire alarm said break glass could you kick the glass instead of using the hammer?

I’ve heard from someone that you could kick the glass on a fire alarm in a fire instead of using a hammer. How is it that one would kick the glass instead of breaking it with the hammer even if the hammer was present? Would it take longer kicking it? Could it take a couple of good kicks for the glass to break? Also after kicking the glass do you need stand back while the glass breaks? How would you clear the remaining glass to reach the handle?