Loki was pissed! No, Loki was more than pissed!
Loki was fucking seething!
Loki knew that Mark was only taunting him now, and Loki hated the fact that Mark would dare do something like that! Loki couldn't just kill Mark because of the pact that the gods made at the start of the superhuman era. All the gods decided as one that they were not going to interfere in the battle for survival between the anima and the humans. Loki was able to find a loophole through this pact by simply bringing other humans under his command and making them cause the destruction that he wanted them to cause. But Loki never thought that a mere human like Mark would dare to stand in front of him and talk like this! Loki's aura alone in this form is normally enough to kill most mortals without even needing to try, but for some reason, Mark could withstand it.