Hopper didn't expect that she would have jumped so hard at his appearance that the cup she had been holding ended up shattering on the steps of the church he had just walked out of, the man startling a bit himself. He wasn't all too close with Bob, but he was with Joyce and he knew he had made her happy. So, he knew he should be at the funeral—for both Joyce and Bob. However, once he noticed she had disappeared from the gathering of people who lingered, he figured he should see how she was holding up.
Not well, from the looks of things.
His face was rather stoic, not stern but a solemn air about him and sympathy touching into his gaze. With careful steps, he moved to see if he could help clean up the glass that lingered on the stairs, not really talking for a moment before he was glancing over at her as she spoke up. His eyes glanced down, then away to anywhere but her gaze as what she was saying registered before he rose back up to his full height to lean himself against the railing just a bit. He could remember that moment, too—Joyce's screaming as Hopper had wrapped his arms around her to keep from running up to Bob as he was being torn apart. He WISHED he could have let her grieve in that moment, deep down, but he was running in survival mode and needed them out of there first.
Now—well, he was seeing that.
“You can't beat yourself up, Joyce,” he offered up, his voice quiet, “You start goin' over everything that could have happened or what you could have done and it does nothing but dig a hole to sink into. I know—I know he was looking at you, but it wasn't YOUR fault.” Lord knows he had to tell himself the same over the years about Sara.