ok, think the flim is a TV movie or low budget. Think it was a thriller/drama about a guy who is feeling guilty for a childhood friend who he thinks dies when they slip off a blank in a abandoned warehouse. Only to realize years later they didn’t die, it was red paint and not blood he remembers.
“The Final Cut”(2004)
http://www.imdb.com/title/tt0364343/
‘The resulting memories show Hakman attempt to dissuade Louis from crossing the plank and stepping in red paint, not blood.’