Correct. At 100 feet he might get pelted with a couple fragments, but generally no damage. Let's just say that the ballistic coefficient of a grenade fragment is very, very low.
Even if the President was out of range if the crowds were anthing like I saw on TV a whole lot of people would have been killed or injured if the thing had detonated.
Would have been a great embarrassment to the Georgian people and their Government.
The terrorists would have counted coupe big time.