John Baird scored an injury-time winner as second-placed Falkirk came from two goals down to beat St Mirren 3-2 in Scottish League One.The Saints took the lead as early as the third minute when Scott Agnew's wind-assisted corner found the net and were two up seven minutes before the break after Stephen Mallan broke clear and slotted past Danny Rogers.Falkirk got one back 10 minutes after the break as Luke Leahy headed home David Smith's back-post cross and were back on level terms after 72 minutes when Agnew fouled Tom Taiwo and Baird smashed his penalty straight down the middle.It looked as if the game was heading for a draw before Smith squared for Baird to tap home with the last kick of the match two minutes into stoppage time to make it four straight wins for Falkirk.