As sure as he was that he would get beaten into minced meat, Vikram knew there was no other choice. In order to live, he must evolve, not just genetically, but also through fighting.
If he gives in and uses hot weapons for such a small fry, despite the size of the bear, then he would have no other recourse when it comes to mid level bosses. He is absolutely sure there are plenty of them waiting for himself inside the bear portal.
Last but not the least, he doesn't want to destroy the building.
The solarium is built atop pillars. If the bear continues hitting the pillars, the structural frame will have issues. Worse yet, as an engineer, he knew, these issues will be minor, as such, will not allow for the refixing of entire roof, nor would they let them live as comfortably as they should here.
Thus, like all working men who are barely graduating from being misers, Vikram jumped down to save the money.