Just Speculating
			 
			 
			
		
		
		
			
			The fastenings of the spear head have a 'last ditch' look to them.  
I'd guess that the shaft was cut to facilitate either easier transport from the Philippines or for hand-to-hand combat. 
I have seen Budiak with an iron loop at the butt end and I believe this was to facilitate retrieval of the spear by an attached cord.
		 
		
		
		
		
		
		
		
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