He could be Flemish Belgian.
Knockaert used to do the same when we were in the Championship. It prevents the ball going under the wall like a daisy cutter.
I saw LuaLua score a goal at Elland Road, just like that. The wall jumped, but he struck the ball hard straight under.
I may be wrong but i think it was us that started it against Chelsea , a couple of days later Arsenal copied it and got the credit .