Its given fog here for the next few days so even though the sleet was coming down quite bad last night I decided to brave it and see if Charlie was at the area I'd baited. Got there at 8pm and checked the field and adjacent fields, no sign. Checked the bait and it hadn't been touched from previous day. Decided to walk down to the far end of the property and check fields that side. As I walked into the field I picked up a set of eyes at 300 yards(I know the land well and exactly how big most of the fields are) and another set 40 yards behind(in a field that's not my permission) my first response was defo fox but they were very close to a badger set so needed to be sure. Decided to track the hedgeline 100 yards to get a better look. Got in a good position and used the NV to watch and I'd the eyes. Picked the eyes up great but it was down slightly so couldn't see the shape of the animal, decided to give the WAM a blast rather than the Foxpro while watching through NV. The eyes disappeared as it ran down a ditch and came very fast straight towards me so I stopped the call and watched him stop at around 170 yards, gave a quieter call and it started walking then stopped at around 150 yards, could clearly see it was a fox but slight fog kept coming in and making visibility poor. Decided to have a look through scope and take shot (which was safe). I put the lamp on(yellow filter) low and could see its eyes clearly but due to the mist/fog I couldn't see its body at all, I turned the lamp up higher and it started to turn away but turned back, could see its eyes but couldn't even make out its head properly so decided not to take the head shot and didn't want to guess where its body was. It ran back to its starting position 200 yards away and wouldn't move no matter how much calling I did. Could clearly see its eyes through the scope but it was down slightly so couldn't see its body, decided again not to shoot. The other set of eyes hadn't moved at all during the calling or use of lamp. After a further 5 mins Charlie decided to move on. Obviously would have been good to get a round off but I enjoyed the exchange and would rather not take the shot than risk a miss and educate both of them! They were clearly together because I stood and lamped the 2nd field, gave a call and both sets of eyes looked back one set 10 yards ahead of the other. They will keep, I will just have to swap to Red filter next time I'm there!!