Treachery

We can not presume that treachery was present merely from the fact that the attack was sudden. The suddenness of an attack, does not of itself, suffice to support a finding of alevosia, even if the purpose was to kill, so long as the decision was made all of a sudden and the victim's helpless position was accidental. . . .” (People of the Philippines Vs. Vicente Vilbar @ "Dikit",  G.R. No. 186541. February 1, 2012).