Ordinarily, it took quite a bit to move Jacob if he didn't want to be moved. Fortunately for his teammates, he was standing on shifting sand and completely focused on his order to destroy Remi so, when Alexa's repulsors slammed into him, they rocked him back fairly hard.

The following attacks caused him to stumble back a few steps as well before he righted himself and charged once more at Remi with single-minded focus.