No Huddle

[53Hipster76]

I went through the Help file for "no huddle"; what it said is "
You may also select the "No Huddle" box in the upper left area of the
screen. If a play is called while this box is selected, your team will take
less time before executing the next play. No-huddle has to be planned in
advance. It's assumed your team will huddle if this play results in an
incompletion or the ball carrier going out of bounds. "

But, what it does not say is how does it affect the defense. Will the defense be allowed to make substitutions or is just the no huddle there to decrease the time between plays.

Also searched throughout this forum on this subject with no results.

Thanks to all who respond.