Maybe WE need to say it simpler. If you want to avoid bottles exploding because they were not done fermenting, you NEED to take a gravity reading to let you know if it's at or near the terminal gravity. Your bubbles could be because it's still fermenting, or not, but looking at the bubbles or for an example an airlock bubbling or not bubbling, will not actually TELL you what the yeast are doing, nor can we, we're not brewing psychics.
Not knowing the situation of when you racked and if the beer was truly done fermenting when you put it in secondary, we don't know if it was stuck, and the racking started it up again, or if it's just yeast rafts and bubbles on the surface.
If you really want to know, then taking a hydro reading is the answer to knowing if you should bottle or not.
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