4♣ was a splinter with 3+ ♥s, 5♣ showed 0 or 3 key cards and 6♦ apparently showed "KQ", I assume the KQ of ♥s, I don't remember; besides GIB should infer it. These were auto-alerts by GIB.
So after 6♦ GIB knows I have 3 key cards and has all the information to safely bid the grand but it didn't.