Normally I would have stopped it, since I was there and saw what happened, but I wasn't certain about how they would have reacted, so I didn't do anything about it.
Is this punctuated correctly?
Yes. There are also other possibilities. eg Normally I would have stopped it since I was there and saw what happened, but I wasn't certain about how they would have reacted so I didn't do anything about it.
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Yes.
There are also other possibilities.
eg Normally I would have stopped it since I was there and saw what happened, but I wasn't certain about how they would have reacted so I didn't do anything about it.