Few problems -

1) you're not experiencing how to use the ring, when you can't cut space off or you have too much space to back pedal then bad habbits happen

2) who are your mates? Are they accomplished boxers? If not, what will you ve able to learn from each other? Will you be able to work on focused and controlled goals or will you just be trying to hit each other with little thought outside of that?

3) is it safe? why risk spraining an ankle if you trip or landing on a hard surface or sharp object?Does the risk of long term injury really outweigh the benefits?

4) who is going to be offering an outside insight and giving guidance? Obviously not a coach - if they cant add anything then development will be minimal

5) who is going to keep unbiased control?

IMO its a bit of a waste of time and a risk.

Floor drills outside of the gym would be a better option.