It wasn't much of a delay, audio is very mumbled from CHS, but was just nature doing what nature does.
(down here in FLA, we're used to this

CHARLESTON, S.C. (WCBD) – A Charleston International Airport flight ran into an unusual delay on the taxiway Saturday night.
Delta passenger John Moroney said his flight from Atlanta landed in Charleston around 7 p.m. Saturday when the pilot announced a delay.
An alligator was passing across the taxiway. The pilot briefly held the plane to let the gator pass.
Welcome to Charleston!