Fred looked quizzical, and he let Roger grab his arm, already leaning past the other man to look at see exactly what had gone wrong in the first place.
That was when he slipped. It would have been embarrassing, if he'd had time to be embarrassed or really if he even understood the concept of being embarrassed - which he didn't - but there was a stray bit of canary custard and leaning that way sent him into Roger, and sent them both into the flames.
It was a few full minutes before he got his bearings enough to grab for an open grate, and who the sodding hell knew where they were ending up?