I don't know if you've talked about this before, sorry, but some hours ago you reblogged that deleted scene from The Avengers with the tag "so many things happening here!!!" and I'd love to hear more about that if possible? :)
(referring to this gifset)
so first of all: there’s the dramatic reaction when the Other first contacts him - you see the same flinch and pain when he gets kicked back in their first conversation, and this time it’s when the Other apparently just grabs him - in the middle of a fight - and it pretty obviously isn’t fun. this isn’t a willing connection, or one Loki has control over.
then there’s the way Loki is reacting to the fact that the attack is failing. he doesn’t seem particularly upset or angry about it - or even really that frustrated. his response to the Other’s anger is almost flippant, irritated if anything that he’s being blamed for the Chitauri’s shortcomings. it’s “I’m trying my best but look what you gave me to work with”.
it also makes pretty clear that Loki isn’t really in charge. he was there to let the Chitauri in, but he’s not giving the orders and he’s not in control. and he’s very much not happy.