3rd base is not forced to run in this case, so no questions
there. The main consideration is 1st base.
If infielder purposely drop a potential fly-ball, then 1st base
will be tricked not to run. Two scenarios:
a) he throw 2, 1st base out.
b) he throw 1, batter out.
Hence, potentially double-play. Hence in-field fly will apply
here
