In August 2015, a significant rockfall catastrophe took place in Manikaran town. This event led to the destruction of a six-story Gurudwara building, resulting in the tragic loss of around 10 lives and causing injuries to 15 individuals who were asleep in the Gurudwara's Sarai accommodations. To enhance our understanding of this incident and to anticipate potential future rockfall hazards in Manikaran, a novel model for rockfall propagation is created. The novelty of this model is to integrate the effect of pre-fragmented rock mass as a source area on the remobilization of deposited blocks, which was evidenced to be of major influence in the site of Manikaran, using a rigid body approach within the Siconos software framework. This endeavor aims to provide valuable insights into the 2015 Manikaran rockfall disaster and offer predictive capabilities for assessing future rockfall risks in the area.