Why sell on a pull back. Some of those that sold after the last...

Why sell on a pull back. Some of those that sold after the last "pull back" had to buy back in lately at much higher prices. Can I suggest Buffet included. I held and am happy to have held. I'll hold until the fundamentaly tell me there is no upside left. That is a hell of a long way off yet. I may trade the swings a little but I will not reduce my holding.I will not be in any false lemming rush.
The fundamentals are sound (with a capital S.)