I've said that you shouldn't have more than one viewpoint within a scene, and that's usually true, but you can shift viewpoint to another character for the remainder of a long scene.
In this scene from my GUARDIAN ANGEL, the heroine has been the viewpoint character through a long chase scene and an interrogation by FBI Agent Mark Faulkner. She and her bodyguard who is Mark's ex-partner are ready to leave. Mark kisses her to make Gard jealous. At that point, I switch to Gard's viewpoint for the remainder of the chapter.
Stepping back, she resisted her urge to glare or hit Mark in his presumptuous teeth. Despite his obvious desire to sleep with her, he had meant that kiss more for Gard's reaction than her seduction. He'd coldly and secretly studied Gard during the whole supposedly passionate exchange. She shoved the car seat forward, his Machiavellian maneuvers beyond her comprehension at the moment, and slid into the back seat. "I'll sit in the back."
Gard forced his right fist back into a hand before he knocked Mark's teeth or the side of the door in and pushed the front seat back into position. He locked and closed the door then nodded curtly to his former partner. "I'll call you."
How did I show a viewpoint change? That's our next subject.