Rookie mistake, they forgot there's two of them.

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Transcript:

Panel 1: The lead thug gets back on his feet rubbing the side of his face where Abby hit him, "And she's just one goblin!" 

"But-", assistant thug 1 starts to say.

Panel 2: The lead thug steps up to the other two, complaining, "I swear, I gotta do-"

Panel 3: Noticing a light above them all three thugs look up as the lead thug trails off, "everything?"

Panel 4: The source of the light is a glowing ball above their heads, the result of the spell Erry had been casting while Abby kept the thugs busy.