Went to the Queen concert last night and saw someo...

Went to the Queen concert last night and saw someone take a serious fall because the slipped on a slice of pizza. I fully understand that accidents happen however once the staff had helped the person up they the decided it would be good practice to walk away and leave the pizza where it was for someone else to slip on. I spoke to the staff member and his response was he had notified the relevant team to come to attend to the matter. When I I formed him he should be standing over the pizza to prevent another incident he clearly didn't give a damn. Shocking and totally unprofessional attitude with no thought given to the potential outcome. 0 stars for this manner of staff & element of the evening.