When you load an NDI camera clip, the blue line appears on the camera viewfinder but there is no red line when the clip is triggered.
NDI tally colors are blue=loaded stream, green=preview (for typical switchers), red=program (that would be a triggered clip in Resolume).
Also it appears that once you load a clip in resolume, the blue line doesn't go away on the camera viewfinder until you close Arena and reboot the stream.