Sei was stunned at the scene that appeared before him while Ryou, who looked like he was being chased by monstrous creatures, ran for his life as if he didn't care if he crashed into Sei. His fear of his boss' wife was way greater than his fear of his Boss at that particular moment. So he ran, hoping to find cover behind his boss, while shouting for help, not knowing that Davi had already stopped.
Ryou was running so fast that he could not have stopped himself from crashing into big boss man, but in that split second, Sei simply dodged the desperate Ryou as his gaze remained focused on his wife, causing Ryou to crash into the car instead.