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I don't think it's a good idea. Compare the following sentences:
I did that by illustrating... - Я делал это, иллюстрируя...
I did that illustrating... - Я делал это, иллюстрируя...
The Russian...

Let me use a simplified variant of the sentence: "He said it illustrating..."
Of course he used illustrating to confirm what he was saying but illustrating per se isn't the means by which he...

It would have been gerund if the sentence were something like that: "he proved it by illustrating" and illustrating here can be replaced with "the action of illustrating", the same goes for Woland's...