This video on youtube shows a girl having a training session with her friend. Just as she is on the verge of defeat the girl suddenly starts to ¬†grow into a giantess. Seeing how she is at an advantage the giantess begins to attack her opponent but her opponent is ready and no sooner as she attacks he dodges every move she makes. The giantess becomes angry as she starts to crush them with her foot but even that proves ineffective as the tiny man manages to avoid her. After a huge gust of wind, created by a fan that the tiny man is holding the giantess decides to stop and seeing how they are worthy agrees to aid them. The two tiny people are really have and to show her gratitude the tiny woman presents the giantess with a jewel and a scepter.
You can watch this video here Dragon Ball GTS