The researcher in question was the anthropologist Mori Ushinosuke. According to a book recording conversations with Mori, when in 1906 he was doing a survey of plant life along the Lakulaku River, he was nearly beheaded in Talunkeng by demand of Aliman Sekun, the younger brother of the leader of the Tafen tribe. Tafen was the most powerful tribal community in the Lakulaku River area.
據楊南郡譯註的森丑之助「南中央山脈探險」的談話紀錄顯示，一九○六年他因調查拉庫拉庫溪植物，抵達大崙坑社時，遇到了提著一顆人頭又要來索他頭顱的大分社頭目之弟阿里曼・西肯。