If you deal with children that have behavior issues, or may end up having a little bit of a behavioral overreaction, maybe it's due to a sensory auditory sensitivity or tactile sensitivities. Using that quiet corner for calming, kind of like a time out could be a beneficial thing for that child.
If they need to come back and finish their work at a later time, if you need to move on to the next subject and that should be okay.
We don't want the kids to miss out. And obviously, if you're having a difficult time with something and they're becoming angry, they might need to remove themselves from that situation. Take a five minute break or go outside, take a brief walk, come back and restart.
Also, you need to look at cues from the child, do you see them getting agitated, can you see them getting frustrated, watch their facial expressions so that you can actually try to ferment that big behavioral overreaction. So that you don't have to end up losing a child for an hour due to an anger problem.
Being able to calm them after they're getting a little agitated, even just going behind their desks and giving them some gentle shoulder pressures could benefit that child and actually help them refocus, and be able to continue to participate in that activity.