However THIS might reveal a bit too much so you'll have to guess what he's saying. And remember, don't trust any hints I give

i think this is what beldum is saying (collector, we need to cook METH)

Not even close

"Collector, Your a grave threat to my plan to dominate the Multiverse"

Still not close but yes he is
Remember, do not trust ANY of my hints

"Zanthor you failure"

Getting warmer

That's actually really close to what he said

"Zanthor, you have failed me for the last time"

Colder...

Damn
Zanthor, Allow me to deal with this"

I'm tempted to just send you the original frame

He revealed a piece of information he shouldn't have that may or may not turn the tides of the battle

(remember, I could be sending you in circles)

Oh okay, fire away

He said something along the lines of "I have backup"

Okay, I'm gonna make a teaser of Halloween Inkmatas

Just to be sure we're on the same page ZANTHOR said "I have backup" not beldum

I love that face

He's the derpy boi

"You failed, zanthor"

Getting warmer

"You idiot, zanthor"

He does call him a fool so you're pretty close

"you fool, zanthor. You could have killed him."

Let me tell you what zanthor did so you can more easily figure this out

Zanthor accidentally revealed a piece of information that he shouldn't have and now the collector might know beldum is watching the battle

"You fool, zanthor. Now he knows we're here."

Yes
Except for those last two words you got it

"you fool zanthor. Now be knows I'm watching"?

No, I meant remove the last two words

Oh