Curate, connect, and discover
went on twitter and actually i think some ppl are slightly misunderstanding what matakara meant when he accused arajin of lying. like...it's true, arajin never lied to matakara about wanting to fight in the present, so it would be unreasonable to call him out on that specifically. but like
with the way the emphasis is placed on arajin's strength the whole argument, plus the cut to the flashback, matakara was asking if a) arajin's strength/bravery, and b) the promise made to him in the past, the foundation of their entire childhood friendship, were a lie. which, y'know, the promise wasn't, arajin definitely meant it at the time. but arajin doesn't want to admit that or outright deny it, so he deflects by saying it's not true anymore.
to me the focus of the argument was arajin forcing matakara to see him as he sees himself (ie. as a weak, selfish coward), shattering matakara's delusional idea of him in the process. arajin using senya to become strong isn't an inherently malicious lie, and i honestly don't think matakara thinks that either. to matakara the 'lie' is both the version of arajin he made up and the genuine things arajin told him in the past.