The Park Ranger does an excellent job setting the scene for the fight on July 2. When he speaks of the 1st Massachusetts (deployed as skirmishers) falling back to the Emmitsburg road, he does not mention that orders came for them to reform directly in front of the 26th Pennsylvania. Carr afterwards blamed an aide for the miscommunication, but considering Carr's ineptitude, I'm not so sure. In any case, the 26th could not fire back with the Massachusetts men blocking their immediate front, and the Floridians were able to get close, as noted, and deliver a devastating volley that knocked both the 1st Massachusetts and 26th Pennsylvania essentially out of the fight, clearing the Floridian's path in front for some distance and enabling them to overrun part of Weir's now vulnerable battery just off their left front.
The other comment relates to the force that passed the Floridians right by about one hundred yards and forced back Wilcox while the Floridians were knocking heads with the 19th Maine in their front. The Ranger seems to infer that it was Willard's brigade, which did pitch into Wilcox further south down the line, but the more immediate threat in this location was the 1st Minnesota, which I don't think he even mentions. Their epic charge not only stopped the 9th Alabama cold on Wilcox's left, but it was also disconcerting to the Floridians to learn that the enemy was now considerably in their right rear, in what force they could not readily discern given the smoke and confusion. It factored into their decision to fall back.