Be a brother is hard work
The Avengers were getting ready to fight furiously, even lost their lives if necessary, as Thanos opened the portal and descended to Earth.
What they were not ready for was the fact that they had to stop Thor from strangling his brother instead of helping him.
(Come on, this was Loki they were talking about. They still haven't forgotten his role in the Chitauri attack. And, yes, they were currently united to face a greater threat, but still, no one will be surprised if Loki suddenly betrayed them. They even hoped that would happen soon so the backup plan for that scenario could be implemented immediately.)
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Thor loved his brother. He really did.
Loki indeed had done many things that tested the ties of their brotherhood. But never once Thor hated and wanted to harm his brother (the only remaining member of his family).
At least until now.
Because, no matter how understanding Thor was, there was still a limit that Loki shouldn't break.
Approached and seduced Thanos’s crush -who wisely stepped aside to let Thanos be chewed by his daughters- was clearly one of them.
Loki, NO!
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The Avengers were extraordinarily grateful that some members were too stuck up to drink in the middle of the supposed-to-be-battlefield, so there were still those who were sober enough to prevent Thor from strangling Loki.
(Wait, that was a good thing? Of course it was. If Loki successfully seduced Thanos’s crush, Thanos would try to kill Loki. And then Thanos would be beaten by his crush in return. Two birds with one stone.)
They were even more grateful for Tony's incredible wealth that never stopped supplying alcohol and popcorns.
(Look. Captain just smack Thor! Woohoo. Good job Steve! Ups, now Thor wants to strike back... Hey, who wants to bet?)
As a side note, Tony has other things to be grateful for. He was extremely grateful that Spidey had returned to school so he did not need to worry that the kid would try to sneak a sip.
(No, Mr. Stark. Spidey didn't feel grateful. He missed live show of Captain America vs Thor. Not cool!)