It was a pretty big crowd (Mk 5:31-5:32)

“His disciples

Said to him.

‘You see the crowd!

They are pressing in

On you.

How can you say?

‘Who touched me?’

He looked all around

To see

Who had done it.”

 

αὶ ἔλεγκον αὐτῷ οἱ μαθηταὶ αὐτοῦ Βλέπεις τὸν ὄχλον συνθλίβοντά σε, καὶ λέγεις Τίς μου ἥψατο

καὶ περιεβλέπετο ἰδεῖν τὴν τοῦτο ποιήσασαν.

 

This discussion can be found in Luke, chapter 8:45-46, but not in Matthew.  In Luke, the discussion is with Peter, not the disciples.  Mark said that his disciples said to him (αὶ ἔλεγκον αὐτῷ οἱ μαθηταὶ αὐτοῦ) that there was a large crowd pressing in on him (Βλέπεις τὸν ὄχλον συνθλίβοντά σε).  Why was he saying who touched him (καὶ λέγεις Τίς μου ἥψατο)?  How would they be able to tell who touched him.  However, Jesus looked all around to see who had touched him (καὶ περιεβλέπετο ἰδεῖν τὴν τοῦτο ποιήσασαν).  Jesus was determined to know who had touched him.