I personally think that they (Lydia, Nika, Tanya and Chris) had been noticing how “wound tight” Declan was, and seeing Stacia being threatened Declan used a larger show of power than he normally would, my thoughts is Chris jumped the gun believing Declan may finally snap (possibly thinking of his own reaction if it was Tanya in Stacia’s position as many people had mentioned how similar Chris and Declan are, including himself) and it was Grim reacting on Chris’s behalf (after Awasos being shot at grim came out with a vengeance) and grim isn’t exactly the best with talking, and with Declan seeing grim instead of Chris, constantly threw up shields, not wanting to harm his friends but not allowing ANYONE near Stacia.
BUT saying all this, that’s just how I saw the situation 🙂