I love to chase this pair with my IIE. Finally with a good, fast, 200mm telephoto lens (Carl Zeiss 200mm/f2), I snagged the pair in a single frame with help from a 12nm H-alpha filter.
Here's my latest attempt on a chilly, windy, Aug night at Mount Pinos:
and a still:
Sony A7S, N-Vision Relay Lens, Gen 3 thin-film IIE, 10 sec, 320 ISO