I found a bug with these enemies. This enemies don’t run to you. Only attack launching radioactive attacks in a long distance, and this is boring. In HL1, these enemies run to you and hit you with their tails.
Thanks! I hope people see this. 
I agree, before in HL and it’s expansions I had a huge fear of Bullsquids, I dunno why but they are just terrifying to me… 
And they would charge at you if you are in a running distance to them which was scary lol. But now they just vomit on you and you shoot at them while dodging their attacks…
They go after Headcrabs rather aggressively with all the attacks you mention.
Bullsquids are weird. I had a situation where I had one at the end of a long hallway and I wanted him to spit down it, like a turret. It would seem that after every second or third spitting, he would waste a lot of time repositioning (even with a line-of-sight to the player), walking in the opposite direction, and not reacting to getting shot while this happened. To try and improve this, I gave him an aiscripted_schedule and told him, hey, keep attacking the player and don’t stop. And this caused him to do his 360 spin attack for no apparent reason, even though I was halfway across the level. In fact, it was possible to stunlock him because he refused to move on to his normal routine until he did that 360 spin - every time he was shot, it would reset the spin animation and he’d try again. 
I hope one of the Moderator Team watch this post.
I finished BM today, and I noticed this little issue. I remember that Bullsquids were used to charge the player in the first version of BM (2012).