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Given the following post, respond as if you're commenting on Reddit:
human
[Avengers] why did Thor hesitate in picking up his hammer?

After he's thrown out of the helicarrier and escapes the glass cell, he goes to find his hammer, finds it, goes to pick it up, then hesitates as if he's uncertain. Why?
gpt
Because he knows that if he picks up that hammer, the next thing he'll be doing is using it to fight and possibly kill his brother Loki. Thor still cares for and is somewhat protective of his adoptive brother, all throughout the movie he tries to prevent harm to Loki and wants only to take him back to Asgard where he'll stand trial (and possibly be rehabilitated?).

It's the same reason he didn't simply call the hammer to his hand, Thor is considering his options and emotionally preparing himself for the fight to come.