Exactly, that’s an adequate scenario. Therefore the proband (smile) "lost“ the chance to react to the second video actually because his reaction was mentally addressed to the first video. In this case he showed an incorrect reaction twice: There was no reaction for the first video and a wrong reaction (for the most part) to the second because in my experiment at least 600-700 ms of a video clip have to be watched to be able to show the right reaction.
Thanks.