I was doing a routine brake bleed and had a mishap when doing the last wheel. My spanner slipped cracking open the nipple, lost the hose. Then I think my assistant raised the pedal and a buch of air was introduced into the system.

Back to square one I tried to bleed the master cylinder and I cannot seem to get the air out. Bubbles just keep appearing after a dozen fills of the reservoir. Been at it for hours

So much air has come out that I'm starting to suspect that air is getting into the system somehow. After that much bleeding should I start suspecting a deeper problem?