In layman's terms - that would be bad.
If this is proven to be true (and it would not shock me in the least), then this collapse would be anything but a fluke occurrence, and, in my opinion, the entire length of this ceiling system would be at imminent risk of failure.
Channel 4 in Boston is reporting something similar.
CBS4's Joe Shortsleeve was told if the bolts had been properly fastened to the tunnel ceiling there would be tearing or damage as they pulled free from the ceiling. But we've learned the break was clean as if it never screwed in and the glue just let loose.