[Guido]

I am speechless as to how L and Light's combined intellect trigger the chain reaction sequence of events that forced Higuchi to step out from his hiding spot and race toward digging his own grave for what would be the unavoidable outcome for the next episode.

The anxiety and tension rose every second to the tempo of the infamous biblical song track playing, as the tune intensified with the rage and frenzy of Higuchis' tantrum due that he'll be soon exposed before national TV.

Spoiler:

The plan has for goals two objectives.

1. It gave certainty and a complete feeling of full relief for L to realize and witness for him that the power which passes from people to people is the work of a mortal by not yet scientifically proven means.

The questions that L asked to Light on the presumption that the latter as Kira would recall the previous murders were to deduce that Kira has absolute free will to deliver or bestow the power to anybody else of his/her choice at whatever time the circumstances call for.

It may had seemed suspicious if the power had been transferred earlier before the killings had stopped upon Light's detention, but that realization also proved to L that the power transferred upon the last minute when he was about to interrogate Light, sheds into the light (no pun intended) that Kira wants to conceal his killing method from ever being exposed, and henceforth, demonstrating ultimately that the killings are done by human ways and there's no supernatural intervention of a divine being at work.

2. To force Higuchi upon a situation where he finds himself all alone and by himself to get out a dead-end maze. This course of actions obviously has the intended effect that L and Light predicted to guide Higuchi's hand to make himself fall right int the trap, as the most secure manner to find out and acquire the method that Kira uses to murder without being physically involved at the scene of crime: a.k.a. the Death Note.

I do agree with Omni and Garten about L's erratic behavior with the food. Those shots of L holding the pastries and cakes felt more like I was watching a culinary show, than taking the plotline seriously and more on how the episode developed.