Roger wants to hurt anyone even willing to hurt himself just to see someone get hurt.
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I'm assuming you mean the double-sided spear? The double sided spear symbolizes good and eveil, one side of the stick being Ralph, the other being Jack. Also, when Samneric first tell Ralph about the double sided spear, its kind of a revelation for him. When Jack's tribe killed the sow, they used a double sided spear, one to stick in the ground, one to stick the pigs head on top. When Samneric tell Ralph that Roger has a two sided spear, it is a realization that the boys in Jack's tribe are going to do to him what was done to the sow.
ralph grabbed Eric's spear and jabbed at roger during a "kill the pig ritual"
Ralph
Jack
It is impossible that anyone shot the pigs nose because of the fact that they did not have any guns. The first pig that was killed was stabbed by Jack with a knife, who was accompanied by his hunter-turned choirboys.