system
Given the following post, respond as if you're commenting on Reddit:
human
[MCU / Avengers] In Avengers 1, why did Loki come through the portal looking strung out?

He comes through the portal and he’s pale, sweaty, breathing hard, and his eyes are comically baggy. It actually looks like paint under his eyes. What’s going on? Is taking tesseract portal painful? It doesn’t seem to be in Avengers 3.
gpt
We saw that the Other,  Thanos' seneschal, would induce pain in Loki at the slightest provocation. He probably did that a lot, including as a last minute reminder to Loki not to screw up and/or betray them.