"during" is usually not followed directly by a gerund. The gerund would most likely be preceded by an article:
During the building of the house, a severe tornado occurred in the area, completely destroying the construction.
The director realized during a reading of the play that the entire third act had to be changed.
However, there are some instances where "during" is followed directly by a gerund, as in "Don't disturb the animals during eating."
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