Heavily unfair to criticized him for any of their goals he was involved in. First one, he is following the shape of the defense and cuts inside with every right. Daniels completely free on the far right is Ramsey's responsibility who is doing fuck all at this moment in midfield defensively. After the long ball Bellerin has to cover a lot of ground to make up for Ramsey's lack of contribution and at that speed it is really hard to stay adequate if the attacker makes the move to cut inside.
Second is a blatant faul, absolutely no fault of Bellerin's. Fraser has the advantage in pace as he starts his run earlier but Hector did well enough to get to the ball first as he should have and to guard it with his body. Not calling the foul is yet another bit of decisive and terrible refereing, even worse in the light of the penalty given for the exact same type of offense. Shame really as Oliver is usually one of the more reliable officials.
I am not saying Hector played well, he certainly didn't look convincing but I don't think he was at fault for any of their goals.