Reaching for the Sky
An eight-foot tall goliath has the same effective reach as a three-foot-five halfling despite having arms three times the length and potentially swinging a weapon larger than said halfling in a diving position. But that same halfling with a small-sized longspear (i.e. a sharpened stick five feet long) can hit something the half-giant cannot. This is a little odd to say the least.
True enough, but if the halfling is either a) stuck on the end of the spear as bait, or b) using the spear as a pogo stick then one way or the other he CAN reach ( be reached by? ) the dragon!