What Was the Purpose of Poisoning Brock?
The primary purpose of poisoning Brock was to manipulate Jesse Pinkman emotionally and ensure his loyalty to Walter. By creating a crisis involving someone Jesse cared about, Walter aimed to strengthen their partnership and eliminate Gus Fring's influence.
How Did Walter Administer the Ricin?
While the series does not explicitly show Walter administering the ricin, it is implied that he used a controlled method to expose Brock to a non-lethal dose. This allowed him to achieve his goals without causing permanent harm to the child.