Part 3 noJS: Error? block x2

First, see part 1 for context

(just a quick one as I am still working on part 1)

credit to @avi_shor for this one I just made because of his JS ENABLED block:
untitled script pic(6)

And one I had made by myself:
scratchblocks conv script pic(2)

What are the rules of this game? Is it okay to use the SAFELY TRY library, which is written in Javascript (inside Snap!, as for all libraries that require JS)?

anything that does not give a JS not enabled error is fine; with simpler blocks I try to not use libraries as a challenge.