At the playground, there was a little boy (around 18m-2y I think) who ran out of the gate when another family got in. The mum who had gotten in looked all around the enclosed space for the parent /minder, but only got quizzical looks from all the other parents there. I guess she assumed they were in the larger park and let him out. Five minutes later, the CM (who has been sitting in the far corner and not watching him) notices he is in the larger park and calls for him to come back.
Not long after, there are terrified screams from a girl (maybe 5y) who has gotten stuck on the whirly cup ride and is going round at very high speed, and at one point she goes really limp and is almost flung out of it. Fortunately she was alrigght. Again the cm did not notice that the mindee is in danger and it took her a while to come to the help of this poor girl.
I didn't do / say anything (nor did any of the other parents), but now feel guilty for not doing so. After all if that was my child she was minding, I would have wanted another parent to say something... What would you have done??