Danny kills the ant. It hadn't belonged in his space. Space is the personal area surrounding individuals and objects. A drug can have space. The world has space.
Space can collapse, be cut off.
When two people merge, space disappears. When space is invaded, the invader, like the toiling ant, is eliminated. Michael is heading the other way, allowing Angie to invade his space, to lead him to consumerism. Back to the coffee house, where Danny is meeting Angie. Soon, Angie is injecting heroin with Michael.