So what should Data have said?? There simply wasn’t time for talking, the great thing about this scene was that all the communication took placed WITHOUT talking. When Data put the transmitter on Picard’s shoulder, well, there were no words needed, they both knew what was going on and so did we.
After Picard beamed off the ship, Data was alone…should he have said some sort of clever line like “Clone THIS!!!” before blowing the ship up???
And just what does one say when one’s clone dies in front of one???