Ok so trying to get everything about the scene
The mc enters the room and it's normal, then it gets red and we hear a heartbeat, his own heart jumps crashing against his ribcage the moment he enters, the room is cold like he just entered a freezer.
There is someone in the room filled with anger and power "and something else too"
Mc smashes the room open and Cole is backwards, we hear a heartbeat again, the red returns to the room and we hear the sound of a power being used, the same we hear when a mind power is used, Mc seems to feel pain being affected by this power "my brain splits i feel dizzy". He wonders if it's the memories or the drugs he feels sick, very sick and almost bends and vomits.
Now some thoughts
At first i had the impression that all this was Mc's memory powers giving him a feeling that something wrong was happening, maybe acessing the memories of the girls at distance, not enough to now what was happening but at least to feel the dread. However red was never a color connected to Mc's power, we have purple and black for him but never red, the heart is his own so maybe he is just very nervous, or maybe affected by someone else's power, the place being cold doesn't make sense for being something Cole did, his power is fire.
Now there is someone in the room filled with anger and power and something else to, does this mean that the person in question is filled with those two and something else ? or that other than the person with those two things there is "something else too" meaning other person in the room ?
The power is used and Mc feels sick, i known that when Mc started using his memory abilities he used to feel sick, even vomit and almost pass out but it doens't seem like he used any power, more like he was affected by something, his brain splits and he fells dizzy, again looks a lot like how he felt after every path but did he connect to something ???
For a moment i didnt think it could be the twins since they still are lvl 1 and would not affect Mc with any harmful power easily, BUT they ARE spawns of Strenght Eaters, and if one or both of them have this "trait" they would get stronger depending on whoever is there, so affecting a lvl 3 seems reasonable.
To me what is happening is that Amber could be using her Strenght Eater ability to affect Mc and this makes him feel sick, Liz is "dead", Cole is not using any power at the moment and i don't think Mc is either, also the room seems empty. The power and anger are coming from her and the something else might be regret, despair, grief...