Headscratchers / Metroid: Samus Returns

• When the Diggernaut is first activated by Samus it just looks at her then walks away yet in every subsequent encounter it tries to kill her, why?
  • It may have been wanting to fight Samus, but had to wait for its systems to power up fully before it could.
  • its possible at first it recognized her as chozo based on her power suit but some how was damaged off screen and it could no longer tell
  • it's also possible that it wasn't trying to kill Samus at all during the chase. It was probably just doing a routine drilling and Samus just happened to be in the way.
    • As for the final fight with it, it probably saw her as a trespasser, given how the arena appears to be a garage of sorts.