Guard 1: OMG look! the dead body of the guy we are here to protect which means it is useless for us to be here now but lets try and find the killer
Guard 2: good plan lets go
...a few seconds later...
Guard 1: well we looked for all of 5 seconds i guess he got away
Guard 2: we now have no use being here but lets wander in totally random directions spinning round every now and then instead of going home
Guard 1: yeah OK
...about an hour later...
Guard 1: hmm lets just look at this one particular spot for exactly five seconds
.....
Guard 1: AAH ASSASSIN
all who ask why the cake is a lie are total IDIOTS!!!!!!!! THE CAKE IS ALWAYS A LIE AND NEVER BELIEVE THAT THE CAKE IS NOT A LIE FOR THE CAKE IS A LIE AND NOT NOT A LIE!!!!!!!!