Final answer:
Lucas is most likely experiencing anterograde amnesia, which is the inability to remember new information while still retaining old memories. This could be due to damage to the hippocampus.
Step-by-step explanation:
Lucas is most likely experiencing anterograde amnesia. This type of amnesia is characterized by the inability to remember new information, while still retaining memories of events and information prior to the injury or trauma. In Lucas's case, he could recall everything about when he went into the bank up until a certain point, but then lost the ability to recall any more information. This could be due to damage to the hippocampus, which is responsible for transferring information from short-term to long-term memory.