Paving slab attack..

Hello all,how are you doing?
My poor husband has a poorly of a rather large size.
In his excitement to get some wood for a shelf for his new refurbished shed he didn't see the paving slabs lent up against the wood..and wham straight down his leg nor just one but two of them. Honestly it made my tummy go all funny when he limped into the kitchen. I cleaned it up and put a dressing on it but it looks awful.
You can't tell from the picture but his leg is swollen and looking reddish..i will keep an eye on him.

 The offending slabs.

Bless him..
sara