Intersection of a line and line at infinity in projective space I understand parallel lines in Euclidean space intersect at the line at infinity in terms of projective space. 
My question is for a single line. A single line if extended to infinity must intersect the line at infinity at some point (correct me if this wrong.). The thing that I find hard to interpret is how could it not intersect the infinity line in two points which are located in the two opposite directions of the line?
I have checked this existing question line at infinity and it didn't help.

Just speaking in "intuitive" terms,
consider three lines intersecting at one point. Keep one line firm, tilt one of the line, making the intersection to move away towards infinity, in one of the directions, slide the third line parallel to itself to keep the one-point intersection. Continuing to tilt beyond the parallelism of the first two lines, the one point intersection and the third line reappear  from the other direction. This might help to fill the intuition gap.
