Chicken staggering, legs blue after foraging in yard last night for first time

[skylavaulter]

I let all 5 chicks out (9 weeks old) to forage for an hour in the yard for the first time last night. Didnt notice any plants that would be an issue but im not an expert. Just went to check on them in their temporary enclosure and both RIRs were laying with their feet splayed out and had difficulty standing. Once they were up they were fine (no limp, injury). But one of the RIRs' ankles are blue!?!?! Does anyone have any thoughts on what could be wrong? No one else is showing any physical signs of an issue.

 

[skylavaulter]

No one has any thoughts?! Please let me know if you've ever seen this.

 

[jentralala]

Bruising, maybe? Did she jump from anywhere up high? Sorry that's the only idea I have

 

[skylavaulter]

No she didn't jump from anything I guess I'll just keep an eye on it.