"Of course! When Shizun disappeared so suddenly, this disciple couldn't help but be worried!"

Was said disappearance warned for? Would it have mattered? Luo Binghe wants to be stuck to Shen Qingqiu night and day; even if there weren't any reason for concern he's going to fret whenever Shen Qingqiu goes away.

And of course, if he happened to have trailed Shen Qingqiu here after finding out which way he had gone and waited a short distance away in case anything were to happen, that was just because he's a devoted and caring husband. And something had happened, so he was clearly in the right!

"It's alright now, Shizun. We'll be home before--" and he pauses to give a small sneeze of his own, "--before you know it."