2nd Nut Flush, did i play this was to passive on the river?

LARSON7

I had a game on 2 p 4 p table, i had the 2nd nut flush, he bet 50p and i shoved, he had the nut flush...

So on this hand i'm worried i might not be ahead on river with the 2nd nut flush. On an all in against a short stack i dont put him on the ace of spades, im worried about the player behind. When player 1 is all in for shortstack, and player 2 calls, I can probably say I am ahead of him here and so should shove. If hes not sitting with the Ace i would have to put him on Jack or 10. If i reshove i feel im losing 10 of spades.

Did i miss out on value by playing this to cautious? I think i did after he just calls the all in.

LARSON7	Small blind		£0.10	£0.10	£11.27
stalkerd	Big blind		£0.10	£0.20	£2.07
	Your hole cards	K 4
mikely25	Call		£0.10	£0.30	£6.68
trevor1954	Fold
Cash_Daddy	Fold
shaun399	Fold
LARSON7	Check
stalkerd	Check
Flop
		4 5 3
LARSON7	Check
stalkerd	Check
mikely25	Bet		£0.30	£0.60	£6.38
LARSON7	Call		£0.30	£0.90	£10.97
stalkerd	Call		£0.30	£1.20	£1.77
Turn
		A
LARSON7	Check
stalkerd	Check
mikely25	Bet		£0.20	£1.40	£6.18
LARSON7	Call		£0.20	£1.60	£10.77
stalkerd	Call		£0.20	£1.80	£1.57
River
		Q
LARSON7	Check
stalkerd	Check
mikely25	Bet		£0.60	£2.40	£5.58
LARSON7	Call		£0.60	£3.00	£10.17
stalkerd	All-in		£1.57	£4.57	£0.00
mikely25	Call		£0.97	£5.54	£4.61
LARSON7	Call		£0.97	£6.51	£9.20
stalkerd	Show	5 5
mikely25	Show	J A
LARSON7	Show	K 4

The_Don90

its fine. 

LARSON7

Did i miss out on value here?

Oppo has just called first players allin leaving £4.61 behind.

If he had a king beat here, surely he would be reshoving?

Should i have set him all in here/ raised?

The_Don90

Nah i think your playing this hand fine much prefer this to others youve shown. Im not great at cash either but given action i think youve got the max from worse here. Remember its not about what they'd do with better but will they call with worse, and i dont think most will