Insanity and certain area with an armored beast

Yeah i am trying this on insanity(normal insanity, didnt know there was insanity+), i couldnt check that from within the area since i simply cant survive long enough, either im on top of the building and get surrounded or i am inside and the 2-3 shielded kett come in the room at the same time and pretty much ignore everything and come towards me behind cover and  can barely kill the first one before the 2nd one is here >.>

I ll try to check again with a sniper, the issue is i dont have enough ammo so i have to retreat and get more every time, i wonder if that resets the situation.

I've been running a vanguard-style Ryder, run into fire to lure away some Kett to the little cornered area behind the main block of prefab buildings (by the only open door into that block) and dodge like crazy, jump into cover and blind-fire while directing your party to attack with you. Dodge button works insanely well, much more distance and 'escapability' than ME3's combat roll, so use the hell out of it.

Assault rifle w/ incendiary for armor, pistol with cryo for organics/unshielded to slow them down. You take a hell of a beating, but so long as you keep moving and dip into cover every so often, you should be able to scrape through.

the Fiend should definitely still be around D: but I have a feeling a fair few parts of Eos are bugged. Or maybe your squadmates managed to kill it?

Nope nothing, at first when i escape it stayed inside the area when i was attacking from outside of it. When i left to get more ammo/guns and returned it wasnt anywhere yet everytime i entered either me or a squadmate said careful, it is still nearby. And it takes quite a big of damage since no way squadmates could kill it on insanity, especially since they were busy with the kett, had to bring them back a few times and they were close to me.

When i returned and was finally able to kill the kett there was no fiend anywhere, not even in the radar, i made at least 3 rounds around the whole place searching for it hoping it ll appear. I went to the place it was kept and got a new quest, a "weapon to use against kett" that sends me to 2 other locations to collect some research.

So either it appears later on when you least expect it or it is bugged :\