Syam + Doughty "feature"?

So... I equipped melee doughty on my Syam. Heavy attack on it does pure heat at base but for some reason it gets 9x CD from doughty with galv reflex stacked

https://preview.redd.it/8e0x3jpda81g1.png?width=2560&format=png&auto=webp&s=b4675ef250a7d50bcbbce6e8f9fce560bf65bc11

https://preview.redd.it/hzqgsx8ea81g1.png?width=1087&format=png&auto=webp&s=b0747e6048aaace4e1da017f7b015a8d9c162396

https://preview.redd.it/i01p2lmea81g1.png?width=819&format=png&auto=webp&s=40a1da942e06d1206a9b888e3e7cea13e8d46759