Strange guard behaviour

[0rcus]

Today i was hunting in Alsius with my friend, but he had to go out. So i decided to check their castle. I went there and guards weren't attacking me, so i started my long way to destroy gate. After some minutes (i think 15) i finally destroyed it. Then i ran inside and i found out, that only melee guards were bugged. Ranged ones were shooting at me, so i hid behind some pillar. Then i casted some shields and activated flag and i hid again and was waiting for my friend, who came back to game right after i got inside castle. He came to me and we were talking about something, when suddenly, a few minutes after he came to me, we conquered that castle. Look at us: conju lvl 48 and hunter lvl 29.
This bug is quite annoying, you can conquer castle alone. Yeah, it takes much time to destroy gate, especially for conju, but we conquered it in 30 minutes +-