1. It was NOT a 2 footed challenge by either player, both had 1 foot "tucked" under the body/other leg.
2. Euell even tried to get his foot out of the way.
IMHO anyway.
After the wait, Tim assume that Sam was not sure as he Sam could see one of each colour, and as Tim could see Mikes Black hat, Tim knew he had a White one. He shouted White.