Incredibly, Rennie failed to punish Geoff Horsfield after he clearly struck Baggies defender Paul McShane in the face on the stroke of half-time. The challenge by the former Baggies hero left Mowbray fuming and was not only missed by Rennie - but also his assistant on the touchline.
Mowbray added: "Geoff Horsfield is a good honest footballer but I saw what I saw. All I ask for is protection for my team. We're trying to entertain and play the right way. There's lots of ways to play football and I've got no problems with how Leicester City play. They are competitive, they get it forward and play to their strengths. I'm just disappointed that we didn't get a little bit more protection today. I don't mind fouls but somewhere along the line you've got to take some action when they're repeatedly fouling. If you don't book people then they will keep on doing it."
Mowbray insisted his side's position at the summit means little at this stage of the season. With Derby losing on Wearside, it was a point gained for the Baggies, who were outplayed at times in the second half. Foxes defender Gareth McAuley headed home 10 minutes before the break to cancel out a penalty won and converted by Diomansy Kamara. That was the end of the scoring but not the action as Leicester, rejuvenated by Milan Mandaric's recent takeover, came within a whisker of recording a fourth successive victory.
Mowbray added: "It doesn't matter being top of the league with 11 games to go. My overriding emotion is disappointment at letting two points slip away because I think we would have warranted three points today."