During the migration of LS to another server, I pushed out an updated version I was working on (rewrote the monster abilities section of code) -- part of that enabled another ability of Electangle, which is a chance to call for help. Also, you'll notice his "evade" ability works a little different, in that you won't actually hit him when he evades, but only hit who he swapped position with. Part of this rewrite allows me to change monster abilities on the fly without restarting LS, so I can enable any "common" abilities, or adjust them, at any time.
All monsters that "call for help" do so at their level and their level does not change within a fight, so their levels will not increase with yours (if yours does). There is little point or purpose in attempting to "farm" such monsters. They also will not (currently) use this while all party members are in town, or if they are non-normal mob (boss, well, ep, etc)
You guys still need to find Chargon

I saw him multiple times in the couple of climbs I did, so he's definitely out there, and using his ability.
Thanks!