Rex looks up to the sky with the feeling of immense pain still lingering on his pierced chest, he was still breathing heavily as the demonic energy leftover that is still present inside his body runs rampant. It makes his entire body numb.
With everything he got except for turning into his Werewolf form, he still got overpowered easily.
The help from Adhara, Evelyn, and even Gistella should be more than enough but the disparity in strength is just way too much. It needs to bare in mind that most of the spear power already got blocked by Denzel before.
Most of the original strength behind that spear is gone, and its momentum is weakened heavily.
And despite all of that and also the spells that Rex used to keep reducing the spear's momentum, it takes literally every strength in his and the others' bodies to just change the spear's direction.