My thought on this is that there are a lot of tools and time out is just one of many. It can be effective but, needs to be used with thought and in moderation otherwise it is not effective. My rules for GD is that DH and I need to both agree on the tactic and both be willing to follow though with what we decide. I have found that the needs of my DD's have changed over time. At 1 year we used a lot redirection, then at 2 they needed very firm consistent consequences, after a couple of months we were able to use simple verbal redirection, now at 3 1/2 we are back to firm consequence. I give them options all the time and let them choose many things but, at times they have to listen without options.
The situation that you presented seems like it would be better to redirect or teach safety though verbal explanation and supervised experimentation. Wish you luck GD has been one of the hardest things I've had do as a parent but, it is very necessary.
Side note:
I have been fortunate to get good advice from family and friends who know my DD's well and what I am trying to accomplish. Yesterday a good friend witnessed one of my DDs having a major tantrum and I didn't handle it well. Failing in front of a good friend was positive for me because I realized that DD had been pushing limits for awhile and I needed to figure out a better way to handle the behavior. I called my friend this morning with a solution to the meltdowns and she was so supportive. She said that she knew I would figure out a better way to deal with DD, wow, she had more confidence in my mothering skills than I did. Have confidence that what you are doing is right for the whole family.
