system
Given the following post, respond as if you're commenting on Reddit:
human
[The Avengers] What would have happened if Tony Stark hadn't shown up in Stuttgart?

When Captain America confronts Loki in Stuttgart, what would have happened if Stark hadn't decided to get involved? Unless SHIELD or Cap. had some trick up their sleeves, it seems that Cap. would have been killed in fairly short order. He was simply out-classed. 

If Loki did kill Captain America, how would SHIELD proceed?
gpt
Yeah, lots of people think they outclass Captain America.

Cap would have continued to fight until someone brought along the prototype weapon reverse engineered from the Destroyer. Loki is not invulnerable and he's not an Asgardian no matter his exterior appearance. 

Don't forget, though - Loki wanted to be caught.