As said in the title.
In PvP player HP bars are visible through walls and then you can autofocus other players through structures.
For example I blew up one jar and then immediately the splash damage was showing me to HP bars of sleeping players in a hidden room. So I found it immediately.
Or what about the occasional bug where if you kill some one, the bar is still visible to you across the map. I have had that happen. Only way is to pull bracelet so you are sure your bar disappeared.
Also, it sucks if you set up a trap room full of T4 volcano thralls with venom daggers. explosions lets them count the defense inside
I once saw a PvP video where the guy explained this system… “Just throw a bomb and if you are lucky, you will see HP bars. After that just gas them out (or acid arrows)”
This PvP has so many bugs… I am still fascinated that people are even playing that mode, when you can lose so many things to bugs. Currently the fyling/jump bug