Faster but still slow
Join Date: Jun 2006
Bikes: Trek 830 circa 1993 and a Fuji WSD Finest 1.0 2006
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The body is able to produce new vessels. It is called angiogenesis. It is quite normal.
Although the example you give is quite spectacular, we do this all the time. Every time you get a bruise, it is the result of blood leaking out of traumatized and damaged blood vessels. If the damage is severe enough the body will need to replace those vessels with new ones. If not, we would eventually lose body parts due to a lack of circulation to parts of the body damaged by bruises. Just imagine even more traumatic injuries and how well people can recover from those!!
Although we aren't exactly as good as a starfish growing a new "arm", we are able to regenerate an awful lot of cell types including vessels which are rather complex.
Angiogenesis is also a bad thing. During tumor growth for example, the tumor cells recruit other cells and send signals to initiate angiogenesis. Those new vessels feed the tumor's massive out of control growth. There are drugs in the pipeline that block angiogenesis which in effect starves the tumor causing it to shrink and die.