Ayyapanum Koshiyum-"The mundoor madan lock"-Final Fight Analysis

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I recently rewatched Ayyapanum Koshiyum (AK) and noticed some intriguing details in the final fight that I hadn't caught before. I also have some lingering doubts. Firstly, kudos to the late Sachy for crafting a fight scene that genuinely makes you think.

I observed that it was brilliant of Koshi to attempt the "Mundoor Madan" lock on Ayyapan, essentially to see how he would escape it. Ayyapan ingeniously uses his leg to knock Koshi's knees and break free from the lock (which seems to be the only viable way to do so). This teaches Koshi how to neutralize the lock.

The next time Ayyapan attempts the lock, Koshi skillfully showcases what he learned from Ayyapan during the fight and effectively neutralizes the lock. This was a cinematic moment for me when I realized what Koshi had done.

However, as the fight progresses, Ayyapan attempts the lock again (for the final time). Now aware that Koshi knows how to escape the lock, Ayyapan ensures his legs are out of Koshi's reach and maintains the lock. Koshi is eventually rescued from the lock by the police.

Towards the end, after the fight, while they're cleaning up, Ayyapan asks Koshi, "Who taught you how to neutralize my lock?" This question perplexes me, as it was Ayyapan himself who inadvertently taught Koshi how to escape the lock. What's the significance of this question?