Slums map Blue Tower Boss

[EmperorFlygon]

So I got to the slums map and moved the machine so it powers the tower and allows me to climb and fight the boss. Apparently when you beat all the bosses minions in the boss fight arena it should allow the boss to be damaged, however when I beat all those enemies the boss still has the forcefield up that protects him from damage. So I am unable to do any damage to the boss. I was wondering if I missed something, or if it's a bug that may need fixing? Or if it happens rarely in files so I may have to restart?

[granto]

When you kill all enemies, the forcefield should disappear. One possible bug is that an enemy somehow did get stuck somewhere out of bounds. Maybe they staggered into a wall, or a teleporting enemy teleported into it. Maybe not into a wall, but some weird location, like outside the planks around the arena. It's not a common problem, but I saw it happen.
The next time you load your game, it should be fine I think.
Reloading usually works with stuck and lost enemies, and it resets the smokebomb invisible ones as well. Unfortunately in this specific case, if I remember correctly, Boss fights restart on reload...

[EmperorFlygon]

It took a couple tries for it to not teleport into a wall, but I got it to work