Yes, Isaiah seems to be demonstrating.
A demonstration is a public meeting or march in which people show their opposition to something or their support for something. You usually say that people hold or stage a demonstration. French students held violent demonstrations against plans to lower the legal minimum wage for first-jobbers. Demonstration involves showing by reason or proof, explaining or making clear by use of examples or experiments. Put more simply, demonstration means 'to clearly show'. A demonstration is a public event in a place that will attract attention, and involves more than one person. Demonstration, or clearly showing (a gamut that ranges from mere pointing to more sophisticated strategies such as chemical reactions), can possibly be used in portraying ideas.
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