Spotting

Was it smaller than your average dragofly? It sure looks like a male Seaside dragonlet. The fact that you saw it on Hilton Head provides a clue for the Seaside portion of the name. They are fairly common up and down the east coast. The females, like many of the species, have brown to tan bodies.

https://greennature.com/types-of-dragonf...

Looks like a Blue Dasher