Then the coach's defensive structure is overly static and has a giant soft spot in the middle.
Right before this, Sanford disengages with Kaprizov to cover the backdoor pass through the middle, and because he and Faulk were right on top of him. At this point, everyone but faulk is in a useful position. Sanford as F1 covers the backdoor while applying back pressure, Schwartz was applying pressure to the puck carrier, Bozak was covering the point options, and Scandella was covering the net front and backdoor.
Faulk, having been on Kaprizov not 5 seconds before, should have drifted with him towards the dot. that would have covered the passing lane in front and allowed him to disrupt the threat in the middle. Instead he's caught at the moment he's disengaging, and his feet aren't set to challenge the play at all. In fact, he was drifting towards the corner at that point, opening up the lane to the man in front too. You'd like Sanford to be a little closer, but the backdoor man was also on the far dot right before the pass was made. Scandella probably could have communicated better as well, but ultimately, that's Faulk's puck to challenge.