Yep and Ive seen it happen to others too, and seen inexperienced doms hurt people because they thought it was ok to keep doing whatever because the submissive (who in no way shape or form should be expected to be cognoscente in certain circumstances especially if a female) was incapable of or hadnt or wouldnt use it.

Which is why it should at best be one tool of many that a responsible dominant can institute but never be used as a crutch to relive said dominant of the ultimate responsibility for saftey during any bdsm activity.