Confused about a Scene (Director's Cut)

In the 157-minute version, there's just one scene I'm still not clear about, even after multiple viewings.

It's the sequence that takes place between John's blowing up of the carriage (then leaving) and his riding along the train tracks with Juan and company (he's joined up with them)...

In this sequence, we first see John lying on the ground at night, stinking drunk. He takes a swig from his bottle, then notices what appears to be some of Juan's kids flitting in and out of sight in the distance. The very next edit shows us John connecting up wires to a detonator/plunger. Far away we see a group of men (some of them soldiers) rush into a large building. Suddenly Juan appears, bringing his foot down on the plunger -- which blows up the building. John freaks out, wondering "Who were those people?" (i.e., they ones just killed in the explosion). Juan explains that it was the German silver mine owner (John's employer in Mexico) and some Mexican Army officers. John is now out of a job -- and, it turns out later, wanted for murder by the Mexican government.

The next thing we see is John riding with Juan and his gang for Mesa Verde, although he quickly gives them the slip when the train comes by.

Question: Why is John rigging a building for demolition, having NO IDEA who is going in there? The dialog indicates that Juan tricked him into blowing up the German mine owner so that John would have no choice but to participate in the bank robbery. That part is logical... but why did he set up the building for demolition in the first place? That doesn't make any sense, really.


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