Conversation so far:
What occurred in 1965?
Butkus made an immediate impact as a rookie.
what team was he with?
Bears.
what was his position?
middle linebacker.
what was his playing style?
Butkus developed a reputation around the league as one of its best players.

Question: what were some of his tackle finsihes?
Self-contained rewrite: what were some of Butkus's tackle finsihes?