At exactly 22:00 minutes into the replay (game clock at 19:00), Gauntlet engages a Gravekeeper and a Gladiator. Gravekeeper dies and the Gladiator is put into the 4 second Stasis effect that Gauntlet's ult produces. At exactly the same time that Gladiator comes out of Stasis, Gauntlet's grapple launches right through him without any effect.
I am not an experienced Gauntlet player but this doesn't look like the intended effect?
The stun from guantlets ulti makes them cleave immune, and the grapple went through him before the Consumed by Power debuff faded off, I'd guess that milisec was the difference between a hit or miss.
Assuming grapple is not supposed to hit him when he's affected by the stun, that is.