I think it is more a problem of timing for him. If the timing is perfect at 25 frames a second then it will be to fast at 30. If you pull the file into Premier or after effect it will tell you. I believe it might be under the properties. If you set it at 25, it should be at 25. Make sure it renders every fram etoo. Sometimes if you say to have it render every other frame it will be to fast also.