Great picture centrarchid.
Did the hen allow the rooster to imprint the chicks. I've watched this many times now and the first time I saw it I was a bit concerned that the rooster might peck the chicks.
What actually happened is he dropped his head right alongside each chick and stayed there for a number of seconds before repeating for the next chicks. When I have seen this the rooster has been the chicks male parent to the best of my knowledge.
No pecking involved, but he does put head down among them as both parties twitter back and forth. It is as if he is in recorder mode as he listens. Duration is for a few seconds. Broody hen does similar as chicks start cheeping under skirt after hatching. Normally it is father / harem master that does this but satellite males will do it too, as they are often sire of a part of brood. Process must be followed for rooster to invest in chicks later, especially after they are weaned.
It does not happen often, but when a rival harem master is involved chicks can be in danger causing hen to move away from him with much more purpose.
Display of a non-harem master showing kindness to chicks may be a form of courtship where he demonstrates parenting qualities. If successful, it increases odds she we be a part of his social group when producing next brood.