Hi Joseph, my father's family is from Taiwan. Growing up, we would have to attend family events to honor our ancestors, and we would always have food laid out before the altar, and would always burn (fake ceremonial) paper money. The idea is that our departed ancestors live in another world, and we honor their memory by offering them food and financial assistance from this world to the next. The burning of the paper money is probably self-explanatory in the sense that the burnt money goes to the next world. For the food, our ancestors consume their "essence" at the altar, and the family then partakes in the festive meal after the ancestors have had their share. In a very similar spirit, I suppose the group of people in the scene offered wine to their dead friends by pouring it into the ground for them to consume in the other world.

這個儀式叫做 酹 lei4 酹 : 以酒灑地面 (水面) 而祭。 祭禮上 與祭者喝了少許或不喝後 逕將酒灑覆於地面 (水面) 此儀式有 1.祭天 2.祭祖 3.祭死去的朋友 4.祭戰場的將士 等等的意義 或 誓盟時 對天起誓 以酒敬天 蘇軾 念奴嬌 大江東去，浪淘盡，千古風流人物。 故壘西邊，人道是，三國周郎赤壁。 亂石崩雲，驚濤裂岸，捲起千堆雪； 江山如畫，一時多少豪傑。 遙想公瑾當年，小喬初嫁了，雄姿英發， 羽扇綸巾，談笑間，強虜灰飛煙滅。 故國神遊，多情應笑我，早生華發。 人生如夢，一尊還 "酹" 江月。 或看 聊齋誌異 王六郎 http://liaozhai.weebly.com/295792084537070.html 這個是 酹 於江面 祭亡魂 還有另一名詞 祼 guan4 祼 : 古代一種祭祀的儀式，將酒灑在地上以告神。 說文解字：「祼，灌祭也。」 書經˙洛誥：「王入太室祼。」 孔穎達˙正義：「王以圭瓚酌鬱鬯之酒以獻尸，尸受祭而灌於地，因奠不飲，謂之祼。」

Basically yes.but somewhere in China,someo people(usually just male)will do that for they good friends or kinsfolk.it's like.... I don't know how to explain it use English,so you should know my English level is terrible.you need find the other people(Chinese)help you to know that

Yes it's some kind of ritual things to show their spirit and will.

Actually they call the drinking on the ground to show respect to the dead people. It represents the drink spilled on the grounds to be drunk by the date people UnderGround.