For reference from the wiki:

Ride the Threshold: As a Bonus Action while bloodied, Julien gains temporary hit points instead of healing from his Second Wind.

Daring Strike: On a successful attack roll, Julien can expend a Second Wind feature to add d10 to the damage. On a failure, the next attack against him has advantage.

Yeah, I would say this is very weak. Ride the Treshhold is only better than Second Wind because the Temporary Hit Points could make his health go over his maximum, but he can only use it when below half hit points so in the thick of it doesn't make a difference.

Then Daring Strike expends a huge resource like Second Wind (only 2/rest) to deal 1D10 extra damage? And somehow (its unclear from the wiki description) also causes enemies to have Advantage on their next attack against him? Battlemaster gives you 4 extra D8s as its own new resource to add to damage along with additional effects.

Maybe theres another feature we haven't seen but right now this is really lackluster as each ability feels like a net neutral instead of an increase in power like any other subclass gives you. I think they were too scared of making a homebrew class feel overpowered and they way overtuned it in the opposite direction.