Hobgoblins' eye changes based on whether or not it can use Thermal Barrier. I've killed well over 10,000 Hobgoblins and yet not once noticed this small detail until I was just mucking about with the HUD off.
[spoiler]Left: On cooldown
Right: Active[/spoiler]
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Did you know : that when you teabag a hopgoblin , they send a relay message to one of the minds , to let them know to target you specifically when you are at low health , it doesn't matter if your fire team is weaker and in front of it , if they can see you they will kill you . Did you know : that there's an abandoned building with an ogre guarding a computer terminal , rumors say that if you kill it fast enough , you can see the golden showers video of trump on it . Did you know : that the cabal have 6 different words for advance , but did you know that they also have 25 different words to describe guardians..? Ranging from kalambria , blueberries , taken toddlers to even one of their most infamous which is Watagatapitusberry. I don't know what the last one means , but you can tell is some nasty stuff because of how Much disgust is in their voices when they say it .