Seifer's just getting upset because you hardly acknowledged him. He gets moody when he is ignored but instead of blowing up I guess he's decided to stay silent.

[ He rolls his shoulders a bit. ]

Staying back there will only be bothersome so just keep up with us.

[ He's not sure why he said that. he feels so tense and on the edge with her right there next to him, but thinking about her falling back behind so much bothered him even more. ]