About a week ago the zeds were seemingly blind, although it was dusk when I played, but I've just been on a server - I spawned just west of Kamenka and as I was sneaking along the tree line to the town I saw a similar figure running along the coast. Friend or Foe? No quarter given or taken - the server messages had included 'if you're unknown and approach us we will shoot'. As we both approached the buildings I was spotted from some distance by a zed, my usual tack is to run into the sea and swim when I'm on the coast so that is what I did. But first I ran to this other survivor and ran in a circle around him. It worked a treat and the zeds all swarmed him, two minutes later a killed message appeared and he was no more.
I continued, but now right by the shore I moved even more slowly and approached the first large building, or group of. All of a sudden zeds, farsands of 'em, all ran to some point north of me. When I say run, more like teleported - the running animation was much slower than the distance they travelled!!!
The immediately to my right (east) a couple of zed are running into the water and there is a survivor swimming away, totally unrelated to the action to the north.
I haven't seen this many zed, nor so fast, ever!
Finally it was my turn, cut off from the sea I headed north to a deer stand, nothing could shake the zed off me and I was even caught a couple of times by a super-speedy bugger. All I could do was climb the stand and hope there was something decent up there, and the zed would take a while to get up the ladder - but no, fate was against me, karma after causing the other guy's death, a empty bottle of whiskey and two zed immediately up the ladder - side by side!!!