@CamilStaps Try R.C. Benton, "
Aspect and the Biblical Hebrew Niphal and Hitpael", PhD, U Wisconsin-Madison, 2009? See Section 4.4.4.2, pp. 322ff: 'The tendency of “fight” verbs towards the Niphal for their active sense is puzzling.' (p. 325) Brief but useful discussion: issue is bigger than לחם alone.