Xmas hauntings, festive nightmares, sadistic serial killers and warrior priests…Be prepared for seasonal shocks a-plenty on Horror Channel this December, with a selection of prime-time movies including an Xmas Day screening of Frank Khalfoun’s boundary-pushing Christmas crime slasher P2, starring Wes Bentley and the George Clooney / Steven Soderbergh produced WIND CHILL, in which Emily…