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See this box right here? It takes 2 hits with the left mouse button attack to break.
However, it takes only 1 hit from the right mouse button to break.
See that? That's the trick, press the Left Button and then Right Button a half-second later.
As you can see, you keep the power of the right attack, but the range and speed of the left attack.
That stalker died with one hit, while with the normal left attack it would died with 3 to 5 hits.
These guys die with 3 normal attacks, but died with 1 right attack.
Remember, left click then right click. Destroys boxes with one hit, just remember it's still a very short ranged attack. Hope this helps, keep on hunting stalkers...