Need Pine Coder [Logic behind some script]

[frostivus]

In here im just trying to obtain, Green and Red Dots (that volume exceeded the threshold to create resistance or support block)

I guess he obtains the average value with sma(volume,72) - 72 is the default value in indicator

but idk what he meant "heavy trading"

so in my opinion it must be smth like this :

heavyTrading / avgVol >= threshold

But i couldnt obtain the dots properly

https://tr.tradingview.com/v/WHt2sIFw/

I guess its also about Candle body size stuff.

Im so sure coding this so basic, but I cant understand logic behind it.

If you help me, please do not forget to share your wallet address too