STEPS TO REPRODUCE:
1. Engage with fight with enemy NPC/PC
2. Have another blue-marked PC fight alongside you while being close (like in triangle)
3. Start using elemental strikes with '-elestrike <any>' to hit enemy NPC/PC
EXPECTED RESULT: Elemental strikes damage only enemy red-marked NPC.
ACTUAL RESULT: Elemental strikes tend to strike blue-marked PC turning it into red-mark
SCREENSHOT:

NOTES: PC's name i was fighting alongside and i subdued because of this bug has been covered with color green. As you can notice i started attacking this PC right after using -elestrike fire, and continued to attacking said PC despite having mountain harpy near.
Server: Surface
Platform: PC