Registered records for Drum before world filtering: death 1. Counts describe entries, not people or lifetime totals. Death sources include Chapter 155.
The filter uses the world where the event occurred, not the character’s origin. Distinct future branches remain separate entries.
The kick Goku delivers at the end of Chapter 154 and the destruction of Drum's head in Chapter 155 are treated as one continuous attack and one event. Tien is the one astonished that Goku defeated Drum in a single blow. Chapter 155, where the outcome can be confirmed, is used as the source.