How was the build up play dribbling class for "LEI" on 2015/9/10?
"LEI" refers to team_short_name = 'LEI'; on 2015/9/10 refers to  date = '2015-09-10 00:00:00'
SELECT t2.buildUpPlayDribblingClass FROM Team AS t1 INNER JOIN Team_Attributes AS t2 ON t1.team_api_id = t2.team_api_id WHERE t1.team_short_name = 'LEI' AND SUBSTR(t2.`date`, 1, 10) = '2015-09-10'